Those bottle neck shaped ones are fantastic -- IF they happen to fit you. Why they would put them on a suit that you can't get custom sized to fit you (nex-gen) is anyone's guess.
I tried stretching my wrist seals over bottles for weeks... it may have helped a little bit but nowhere near enough. So I trimmed them, based on advice from another user (MSilva) in one of the other nex-gen threads down the list. I trimmed over an inch off of each of them, and that actually helped a lot. They are still the same 'size' as before, but now they're easier to stretch over my hands and wrists and they don't squeeze me as tight. The down side is that there's less sealing area, but it still doesn't leak. I know Bare says not to trim them, but what do they know?
I also trimmed 3 rings off of the neck seal. I believe my instructions did tell me to trim the neck seal to fit, but didn't tell how, and they didn't say squat about the wrist seals.
-Ray