cats

Does anyone have any experience with either the Furminator or the Groominator brush?

Hawkeye is a longhair, quite possibly half Maine Coon, and she has a dense undercoat. A wire brush doesn't cut it, nor does a Zoom Groom. Ava is a medium-hair with a fine undercoat, and she's too sensitive-skinned for a wire brush.

We definitely need a brush that's going to be good for them, since it's going to start heating up here soon and I don't want either of them to mat up. (Hawkeye is more prone to it.) A lion cut is out of the question for various reasons, partly having to do with the fact that Hawkeye will plot our deaths and partly because Ava will throw a temper tantrum the likes of which the world has never seen. (Another part is rough play; none of the cats set out to injure, but they play hard.)

Any suggestions are welcome, preferably under about $25.

Edit: Thanks, everyone! I went with the Furminator.