I had a Custom Divers TBK and I couldn't wait to see the back of it - I thankfully sold it.
It's far too big for a single tank, the inflator hose is attached to the front of the bladder (instead of the back where it normally goes) meaning you have to go upright when you want to dump air from the hose, the inflator hose itself is too long and dangles about annoyingly, the harness doesn't fit very well and gives you horrid backache if you spend any more than a few seconds kitted up on land (it did to me anyway) and the weight pouches are awful to load and unload.
There were no good points about it at all. This is a truly execerable piece of kit that should never have been made.
I heartily reccomend you never ever ever buy one.
cheers
r