Dr DW knows a lot more than I do about this little set and about drums in general. I'm still a beginner. However, I've had my little HD-1 for a few days and it's a blast! The petals are very quiet and the loudest noise comes from hitting the cymbals (esp the bell), but it is still pretty quiet and I don't think my neighbors can hear a thing.
When I try to do the double bass thing, the set shakes a little, but no big deal. One qualm I have about this set is the bass pedal's lack of sensitivity--or maybe I don't have the right touch yet. It's difficult to do quick notes in succession, as one of the notes won't be registered (for example, playing 16th notes, on the AH and on the downbeat). Anyone have any suggestions? I do have the set programmed on the most sensitive setting.
All in all, it's a great practice set, and I especially love being able to hear my playing along with a CD, DVD, or MP3 in my headphones. I got the personal drum monitor that was made to go with this set, and it's nice to have too.