Just installed this on mine, though just the trackpad and palm rest areas... nervous about sweat causing the AL to deteriorate (had that problem on a couple of much older MBPs, which might not be an issue anymore, but didn't want to chance it), and you're right, it's almost invisible, and still feels nice.
Yea, my first ever MacBook Laptop which was a MacBook Air had marks around the palm and the trackpad that could not be removed. Every MacBook I bought after that I made sure had some sort of skin protecting the area. Indeed feels nice!
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Did you go with clear or matte? I went with matte, but had a hard time deciding.
Definitely went with Matte since that was recommended if I wanted it to be as invisible as possible. Their website says Gloss gives you better grip. Maybe you could separately order the outer skins as Glossy and then the inside Matte?