HPP 3 vs. Plus

[speedshifter]

Hey guys!  I have heard mixed opinions on the hypertech power programmer, so I wanted to get one and try it for myself.  I have been looking on eBay for one and I see people selling the Programmer III and Plus version.  I take it that the Plus version is a little older, but besides age is there any difference in the unit?

 

I'm looking for the # 370202 unit for my '97 Yukon