I'm sure it would work well enough, I'm just not sure how much tradeoff you'd be dealing with having at least 4 individual feeds for something rather minor. It'd be great for things that you can't see from the master already {like holy power on paladin slaves or combo points on rogue or cat slaves} but I tend to avoid adding additional tools if something else I'm already using can do the same thing.

If I were using ISBoxer, I'd use feeds to show holy power, but I'd still use my current setup for actually seeing procs for AoW and MW and the like.