Fath2o, The other vest I use besides the Mocke is a Kokatat Sea O2 hybrid vest. For me personally, it's very comfortable.
In it's uninflated state, it has a minimal 7.5 pounds of inflation built in, which gives you enough flotation to assist you during occasional spills.
It then has secondary air inflation that can be activated in case of a genuine emergency that brings it's flotation level up to a very high 22 pounds total.
It sort of gives you the best of both worlds... Minimal bulk and comfort with enough inflation for day to day dunks, combined with a level of emergency inflation that is about 5 to 6 pounds more than traditional touring kayak paddling vests.
It also has soft neoprene padding that goes underneath the shoulder straps, a mesh back and multiple side adjustment straps to tailor it's fit.
It's only real shortcomings are it's price is kind of high and the fact that it does not have the ability to carry hydration.