I bought a Spinlock Deckvest Pro (hammar) for offshore last season & have been very happy with it so far. Comfortable to wear, easy fastening, good crotch straps, excellent hood (in the right place) & nice pocket on the outside for PLB. You can also easily fit an AIS MOB1, although I'm guessing that would be true of most offshore models.
My gripe with my Deckvest is the lack of those little toggles so one can attach it to one's oilskin jacket. It's bad enough trying to get dressed when the boat is doing her best to stand on her head, without having to deal with an extra layer.