Casting shadowbond x2 per each vexing with demi-lich (or even lower lich running) is usually net gain...so you can do it pretty much forever.
The problem with it usually comes with having a charmed pet at the same time...if you try max your efficiency by holding off on vexing till you are VERY low health (I think when I first got Vexing I could heal myself to full if my health was as low as 25%). If you let yourself get that low trying to max efficiency you eventually get a charm break at really bad time (duel wielding pet that can pretty much one round you at low health).
Other than that the SB + Vexing + Charm pet (easily doable in KC grps) is very over powered. You can keep your heal running and still do a ton of DPS with only the pet.
I generally don't try to dispell...the amount of times you going to do this you end up cutting your own buffs eventually anyways, even if you get lucky/control it 90% of the time. It depends which buffs you are running I guess, but generally I have buffs on me that I really don't want to lose.
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