We had a lot of problems with mines exploding all the time, plus people failing on lasers, etc (was our last kill in SoO, then we moved to our old server and took vatacions until the expansion), so it was completely impossible to have one even move close to us, unless he was kitting a laser or even a mine. But my experience was being topped most of the time, and only taking damage from "almost" unavoidable add aoe damage, and the casual mine exploding. Tried spirit bond, but found it pretty useless, as we needed a lot more on demand healing than steady healing. Of course, if anything ELSE went wrong (3-4 mines in a row exploding, it happened very often ) we would die every time :P