I had decided to try for a different look and after many questions from some of the top detailers I could ask I decided on 22PLE VX1 Pro glass coating. This is not any better than opti-coat, but it has a bit of a more glassy look. It's not slick much like OC is not slick either. However, I just wanted to try something new for both any future customers as well as to have personal experience.
22PLE has a life span of about 18-24 months, but I have read some believe it would go 3 years under garage kept conditions. It's a silica based coating. You can actually feel the applicator harden over the curing process (total time to cure is 5 days, driving time is 8 or so hours). I have yet to find any info on thickness, or hardness ratings, but it does feel quite hard on the pad. It can be waxed over if you want to add more look to it, though I don't think you would find a better look IMO.
I stripped off the OC and also a lot of orange peel from my car that I didn't get when I initially polished it. It came out nicely and after the coating was added it looked as such: