I'm looking at several models including the PC's and I'm wondering how tight a squeeze it is to climb into the mid bunk? Is it only really for kids or can a adult get in there? It looks awfully claustrophobic. Do you use it? Thanks

Yep, I and the wife use it overnighting every weekend, but just depends on your size, flexibility and tolerance. I'm 5'11" and 180 lbs... I know the 40ss has a much easier access on the starboard size side of the boat. Don't have any experience with the 35ss aft size but if your worried about space the PC will provide more area.

The 35 is like the 37. It's not hard to crawl in it but like Nauti said, just a matter of tolerance for sleeping in a place that the ceiling is close.

Wife and I sleep there on 370SS I'm over 6' and it's no problem.
The lighting, mirror, and AC vent make it a sweet spot to snooze.