Try searching around on here and other forums. They have been talked about quite a bit.
I have one (the older stye one) but I don't really care for it. To me, the call is fine but I don't like the guts in it. They just don't offer a good, solid low end. IMHO, the call is good for trick notes and faster sequences but really lacks the low end.
Keep in mind this is JMHO