LOL!!! i had a dm5..
the td20 is a superior system.. and it works well.. it triggers very nice... the dm5 had double triggers, miss hits... the td20 seems to pick up EVERYTHING and pretty accurate.
It took me about a year to set up my DM5 to get a killer sound, and get rit of miss hits and double triggering, playing that thing for over 5 years now, Never had any regrets of that thing :P
you just have to set it up correctly