I'm going through the same learning experience - I also know that no matter how careful I am, I will eventually scuff the alloys (either because I haven't noticed a curb or because the car-park exit is too tight or some such thing) ... so I am looking at Alloygators too.
I'm glad artsci posted his experience (I know from reading the forums he's been living with his Model S for a while and looked at lots of things) ... I might go with rim blades to start with (they appear to be more easily mounted and have less potential to damage the alloy via abrasion ... but they seem to offer less protection) and then consider a switch to Alloygators if they turn out to be duds.
If you go with Alloygators then let us know how they work out for you.
I've been using the rim blades for a while and really liking them. I've installed them a few times as I traded in my car (two sets) and I have them on winter wheels too. When I had the TPMS replaced on the winters the garage managed to ruin the rimblades in the process so I had to install them again. Also I've had them damaged from a couple of kerbs and replaced them accordingly. I bought an extra kit (kit does 4 wheels) so I can replace individual wheels if I need to. I have found if I hit something hard enough it is still possible to damage the wheels but they have definitely saved me a couple of times. On my winters, I just replaced the rimblades on one wheel which hid the damage anyway. I'll eventually fix it but for now the wheels still look great. As I've never tried the alloygators I can't say if they offer more protection in harder impacts or not. I"m interested to hear comparisons.