Yamaha DTXpress/DTXplorer/DTXtreme

What is the view of the panel on these older, relatively inexpensive 
mono cymbal pads? I plan to buy a second module (brain or MIDI 
trigger) at the end of summer (when perhaps people are being tempted 
to trade up to the new Yamaha gear). Mostly I want to support a much 
expanded cymbal set. On the face of it, these would seem to be a 
reasonable way of adding a bunch of cymbals.

Stewart