This last thursday I picked up my newly retrofitted P85DL which also came with the new software upgrade offering "Launch Mode." First off to help put some context to my opinion towards the "is it worth it" debate, I was looking at this decision from a mostly impractical view. A.) the performance it gets you is way cheaper than what you'd have to pay to make any ice to improve it that much, B.) it gets my P85D back up to the king of the hill status and C.) I have always wanted a sub 3 second 0-60 car and a sub 11 second quarter mile car and I am done with ICE so here we are. If you are the type that would get better suspension, tires, intake or a chip on your ICE then this upgrade is for you. I feel like for most P85D owners this upgrade is for them as it is 5k as a retro and if you have a P85D you already made an impractical choice as a P85 or even an 85 is plenty of power for everyday driving. This is for the supercar seekers that don't want to leave Tesla to get one. First: Can you tell the difference? A Resounding YES!!! I was skeptical at first thinking I am going from 3.2 to 2.6 but man it is a whole new feeling. Before you go on I have not done any testing/timing etc... I have driven about 250 miles since I got it and done about 50 launch variations and this review is solely off my experience in those regards. You do not need max battery turned on to enjoy "Ludicrous." Ludicrous has replaced Insane mode and is always ready if switched on. Even without turning on Max Battery and without using Launch Control (more on that in a sec) you clearly notice Ludicrous. When you stomp on it there is a little more violence as opposed to before, but what is really different is right after you stomp there is this new "pull" for lack of a better term. If feels as though something is pulling you/yanking you forward even more. It seriously feels like I would imagine light speed. I would often do 0-45mph launches in my P85D to stay under the speed limit but still show people how insane it was. This one really feels different from 30mph on, it does not slow down. You hit 60 and you have not slowed from the initial launch. I have literally hit 60mph by the time I cross the other side of the intersection with this. I live near a wide open 55mph highway so don't fret on my launches, thinking I am doing them in residential or a school zone. Second: Where I really notice the biggest difference. Where I noticed the biggest difference in Ludicrous is the sub 55mph when I am rolling say going 40mph and then stomp on it, it feels just like the P85D did from a dead stop. It jolts you just like a dead stop. This is awesome and I love this while driving. Probably the best part of the upgrade. This tapers off after 55/60mph but still at like 75mph is very noticeable compared to before. I would say (this is based off of feeling not actual numbers) sub 60mph it feels like a 30% increase and then you lose about 10% of that as it tapers down every 15mph or so. So at 75mph it is like a 10% increase in power from my previous setup. Launch Mode: I am a little bummed I didn't have launch mode before the Ludicrous upgrade as it would of been cool to test the difference, but launch mode is crazy. Launch mode so far in my experience is really suited for the track I don't even think I would do it if an ICE was trying to challenge me at the line because it can be a little hard to time, but I have had it for less than a week so I am sure I will get more comfortable with it. You engage it by pushing down the brake all the way, (the Hill Assist kicks in) then you push the accelerator to the floor and you let go while still holding the brake down this "enables" it. It will say, "Launch Mode Enabled" and the whole car kind of creeks and the back drops and the front of the car lifts up. This is noticeable, my kids were like, "woah! the front lifted." It is like you get cocked into a barrel or pulled back on a slingshot. Or the start of a roller coaster. Then you push the accelerator back down to the floor and it will start to count down from 4s. When you are ready, you let go of the brake pedal to "release" it. It took me a few times as I was alternating the letting go of the brake at the same time as pushing the accelerator. The gist of it is you push the accelerator and let go of the brake already having the "pedal to the metal." I have never had "launch control" in an ICE so I am not sure if it is the same thing. But what happens next is weird, you literally take off like a bat out of hell, tunnel vision millennium falcon light speed take off. What is crazy is it isn't "jolting" or violent like when you stomp on the pedal without launch mode. The launch mode is holding it so tight, like a greyhound on a leash, that when you let go it just goes, very smoothly. So it is a totally different experience than just stomping on it from a dead stop with no launch mode engaged. The car is so freaking fast that I doubt I will use this much, without it I am still faster than previous and still faster than every car on the road save 2 or 3. I am looking forward to a day at the track where I can really mess with Launch Mode more. Last Thoughts: When I reached full battery warmth I noticed more speed in acceleration from both 0-60 and the rolling acceleration, but not too much different in launch mode. It seems as though Max Battery decreases battery much much quicker, but I still need to play with it as a lot of that could be the amount of Pedal Stomping I did in such a short amount of time. To me it is worth the $$$$, but again I am a guy that appreciates having a Bugatti killer just as much as I do having an EV. The fact that my Bugatti killer has 5 seats, storage and is an EV is even better. So if you are like me then you will not regret it. If you want more rolling higher speed power then you will not regret it either. With all that said my wife's Model X I will most likely configure as a 90D without the P or Ludicrous but only because I already have one. If I was going to just get one Tesla for my family then I would go all out. I am more interested in range on the X as it will be our "Trip" car. Costa Mesa is an awesome service center, always treat me good, text me with frequent updates and take care of me with loaners or rentals. Hats off to their team. There you go, I hope that helps. I really didn't have any idea what I was getting into being the 3rd install in Costa Mesa. So hopefully this helps some of you decide yay or nay. I have a neighbor with a P85D and after the holidays when we get back I want to have him drive my car and tell me what he notices. I also want to race mine and his side by side as that would be very telling. I know there was an early video showing an L vs a D and it beat it like the D beats a +. I will come back and update with some more thoughts. Oh also my wife drove it and said, "did you do something different? It feels different." She is the last person to know the difference between any type of car so I thought that was pretty telling as well. Last - forgive the grammar etc... I just got done driving 10 hours in one day, but wanted to get this out as I thought a lot about the differences during my drive today. Which was in my ICE SUV and I felt like I was Fred Flintstone using his feet Im so done with ICE.