I'm chiming in late, but I'm another one with the new version of the stowable hardtop for my Gen1.
First off, I love it and think it looks incredible. Plus, as everyone else says, Jeff is a great guy to work with, and he really makes any of the possible pitfalls easy to deal with.
That being said, there were a couple issues I had:
1) the paint color didn't match very well, so i'll probably need to get it repainted.... eventually
2) the removable sport bar pad didn't quite match the side pillars... this was subtle, but i had them all refinished anyway in a carbon fiber wrap... looks incredible!
3) I'm not sure about the watertightness of the top, because i haven't gotten caught in rain yet. I do know that water definitely can come through the windows, but I haven't gotten around to playing with the weatherstripping to improve the seals.
4) I got the glass windows made for the top. It's great to have real glass, but the sliding driving side window isn't incredible easy to use. But, it's still better than not having a sliding window!
Overall, though, I *LOVE* the top and don't regret the purchase despite being probably the poorest of the bunch here (now a student

It looks incredible, especially with the real glass windows. plus, jeff is great to work with. I hardly ever remove the top these days, and would definitely recommend it to anyone thinking about it.