Yamaha DTXpress/DTXplorer/DTXtreme

I own the DTXpress I and was wondering if the new line in addition 
to the so called new & improved samples (especially for the cymbals) 
also includes higher sample rates.

I record my set on Cubase at 24 bit with 32 bit floating point. 
Compared to some other samples I've heard from people using software 
drum samples, the DTXpress samples don't measure up in quality.

I'm considering upgrading to at least the DTXpress III 'Special' 
set. I've also been eye-balling the new DTXtremeIIS for the extra 
outputs and sampling capability.

Thanks, Steve