I dive twin 10's at the moment having moved on from single 15 and Pony.
Trim:- My trim has improved tremedously since twinning up although I accept that this could have been improved on my single with some work.
Comfort:- I find walking around dive sites etc much easier with twin 10's
Sitting on boats etc:- I'm 6'1'' and have absolutely no problem sitting on boats kitted up. (I also suffer with minor spinal problems so any difficulties in the sitting position would cause me great discomfort!)
Air use:- I have to agree, I wish i'd gone for 12s for all the reasons stated earlier in thread.
Main reason for wishing i'd gone for 12's:- ABUSE see the HMS Hermes thread about baby twins containing breast milk and formula etc
