(edit, above poster is right - you can't get the benefit if you SBurn cuz you stop draining soul - what follows is my experiences using imp drain soul - I suppose you could Sburn as target is dying, but time it so Sburn doesn't kill - and quickly hit drain soul and stop pet from attacking (have at least one or two other dots still running, drain soul doesn't kill fast)).
I tried out imp drain soul on one of my alt locks. I like it.
But it's inconvenient to use.
I found I had to time fights just right and make sure enough dot-power was on the target (and that target was hurt enough) when I started drain soul. I had to turn pet off - even the VW - before target died. If pet gets killing blow, you get no imp ds bonus!
Good for soloing. The affliction agro-lowering is nice, too.
But also, doing this tons, you're playing the constantly destroying soul shard game. Gets tedious. Just want you to know this before you try it (in the opinion of a lot of locks, there are better ways to keep your mana up, like drain tanking (doing tap and drain health) - drain hunting (ditto) - or using Dark Pact. Imp drain soul is good, btw - but for long grinding sessions - well, if you can handle the routine (time when to ds, turn off pet, destroy shard so you can loot) - it might be worth it.
Edited, Apr 12th 2007 6:11pm by IponemaGirl