From personal experience I can tell you the process is very simple and painless.
Pros:
- No haggling
- No frustration
- No scumbag sales techniques
Cons:
- No haggling/negotiations means you get what you're offered and either take it or leave it.
- You'll be offered less than you could get in a private sale. But that holds true for most trade-ins when dealing with any company/dealership.
I've dealt with sales guys at the King of Prussia, PA store. They explained to me that they make no money on trade-ins. They work with ~30 dealers, buyers in the area. Tesla sales will get the specs of your vehicle and take some photos, then send it all out to those 30 dealers and see what offers come back. They'll take the highest offer and provide you that offer estimate.
At this point it's just an estimate. Next, Tesla will schedule an inspection of your vehicle with you. The inspection itself will likely take 30 - 60 minutes. Make sure to show to the inspector all the little things that will add value to your vehicle (e.g. manuals, dvd player with remote and headphones, etc). Having things like seat guards strapped onto the back of your front seats (protecting them from kids kicking and making dirty) also helps.
Within a day or two of the inspection you will receive the official trade-in offer. You'll have an opportunity to review and accept it on the My Tesla page.
Then you have to schedule the drop off of your car with your DS, which needs to happen within 14 days and 500 miles of the inspection/offer. At least that's what I was told. If you go over those numbers, Tesla will need to reinspect your vehicle again if you still want to trade it in. Keep in mind that time and miles will contribute to the depreciation.
The drop-off itself is pretty simple too. You just need to bring with you:
- The car
- The title (and if anyone else's name is on it, they need to come with you too, to sign some paperwork)
- Registration info
- All sets of keys
I should also add that I received exactly what I was hoping for (based on KBB) for my trade in (+/- $500).
I think that's about it.