:O
For me, the buffs say that they are in effect, but they don't actually give me the bonus that it's supposed to give me.
I Combo Drain myself on an HH and cc to kill another one. I didn't gain any HP, though the buff was still there. Like, a gm gave me HB. I switched channels shortly afterwords. My maxhp was 15000, which is what it should be, but no matter what I did, the actual HP would not go over 9000 (my normal HP limit).
I wonder if that's just me, though. btw, they don't stay forever, either.