Mine is the j/fit 36" high-density foam roller on amazon.
Reasons why: wanted high-density because it will last longer, wanted 36" so I could do my back and have more room to work (I fall off my short one), price, reviews, and I've used j/fit before and haven't had issues
Thanks for your sugg- why, of all the ones being sold, did you end up picking this particular one?
It's been awhile, but I think I got it for pretty much the same reasons the PP got hers. (They look very similar.) It's high density foam and will last a long time. It had good reviews. I bought directly from Perform Better and they included some instructional booklets and a DVD with all the kinds of exercises you can do with it.