I wear a Jet Pilot one. Is is rated PDF 3 I think. Very happy with it. Not very bulky, hardly notice it on actually. It has a side zipper, which has only come apart twice. Once when thrown from the back of a fast moving boat

and another time after a massive stack. Stays together still cause it has a strap. It does ride up a bit when you use a waist harness though. Essential item if you like to bob around the ocean for an hour with broken gear or having problem relaunching in light winds.

(need to invest in a fifth line)