It really depends on the sound you're looking for. If you want really low sounding toms, with no real sustain, then I'm sure you'll love them. I haven't personally tried them, but I've seen some videos and heard some sound clips, and they just sound really dead to me. I want my toms to resonate and my heads to sustain as much as possible, so I would never use them.
To me, heads like these are pretty much go-to heads for people who aren't very good at tuning, because they don't need any dampening. They're already dry enough, so you won't get any of those overtones that can work against you if your drums aren't tuned well. I could see the use of one for a kick drum or something as such, but not for toms or a snare.