Yep, for me it would be WHY do I want it.
For occasional use, like during deer season, I"ve been MUCH happier with a AL cap.
I"ve had caps since the late 70s.
I have had a couple of glass and if you want one on there permanenetly, they seem teh way to go. but I had to cut out rotten wood in mine once and replace along the bed stringers.
As to sleeping, I've slept in both a lot, and could never really tell the difference much.
