Yamaha DTXpress/DTXplorer/DTXtreme

At the hart dynamics website I looked up the review of the DTXtreme 
module and it only gave the module a 3 (out of five I guess?) and 
said the module had poor sound quality and slow inaccurate 
triggering.  Is any of this true?  I have heard lots of good things 
about the dtxtreme so I was suprised to see this bad review.  The 
dtxpressII got a 3.5 so I was wondering if anyone could deny this 
review.  Thanks!