OK, it's been over two years and I had to check my seat again b4 I could answer you. (I've since bought a Corbin seat and switched to that. It seems to agree with my backside, so I retired the gel seat with a full pension).
- No apparent deterioration of the seat foam. That's pretty solid stuff and it's sandwiched between the gel insert and the seat pan. I wouldn't worry about it crumbling.
- I used a regular all-purpose solvent-based adhesive. Nothing fancy, it has to keep everything tight but there's really no chance in hell that anything will fall out. A trip to the local ACE store will take care of that.
- firmer than a stock seat, comfy...I was happy with it.
- only drawback, you could kinda see where the JC Whitney gel inserts were. Sorta like a VPL :dribble: I guess I could have done a better job of wrapping the assembly (foam padding + gel insert) in a thicker liner. But function trumps looks, IMHO, and I couldn't care less.
Hope this helps
Stef