You can read more reviews like this, along with Tony's productions at his personal site -> Tony Long Music.
INTRODUCING THE TRAPS E500 ELECTRONIC DRUM KIT
For me, Roland has always been the name that I have associated with Electronic Drums, but there are many other manufacturers out there, all with slightly different ideas. Like keyboards, I just wish that I could take the best bits from each one and combine them into one super kit! However, electronic drums are expensive so most people are forced into making compromises in some areas when making this type of purchase.