I have a pair. Probably worth $100, I wouldn't say much more. I use them on my e-kit for practice, they get a few hours a month when I can't get at my Tamas.
1. Arrived in disarray, unplayable setup, slave pedal pointed so the pair couldn't even sit flat.
2. No instructions. Fortunately, I have a pair of ICs, so I have a general idea how a double works. Still took a long time to dial in.
3. Some of the cast parts have a flimsy feel. May mean nothing, it's fine so far (light use).
4. The screws loosen badly, the slave and shaft was falling off easily. I fixed it with some blue loctite, but if you're breaking down and moving a lot, look elsewhere.
5. Some people have had a better experience than I, others, worse.
6. You can get used IC's or Elim's or 5000's for $200 regularly.