Yamaha DTXpress/DTXplorer/DTXtreme

I have read all the posts (I think) and just wanted to confirm that
the only significant differences between the II and III are in the box
- the pads are the same?  I am thinking of buying the DTXPRESS in a
couple of months time and am trying to decide if it is worth hanging
on for the III (which may be a while in the UK - not a murmur so far).
 Symbol sounds and a new paint job on the rack may not be worth
waiting for.  Any comments?

Thanks,

Keith.