If you were taking a swipe at the BP/W rec, I guess it didn't register... I don't have a vested interest in what other people buy, just trying to offer my $0.02. However, for the types of diving mentioned in your original post, the Poseidon you're interested in is a poor choice of equip.
Bwerb properly decribed the BC in question...bulky, pseudo-tech. One product description states it has 14 (!) D-rings...that's hilarious. Ask your buddy why he's selling it, my guess it's because it is a poorly functioning piece of gear. You want a BC that improves your buoyancy control, not one that hinders it.
One point of confusion for me, tho...what is tiresome about getting free advice...thought that was the purpose of the board.
Oh well, my gear rocks...hope the stuff you end up with does too.