What's the difference, besides the springs, from the lockright and the detroit EZ? DRM sugested the differences would be above the average reader so they weren't included in the review. So, what are the key differences that make it supposedly better than the competition? How is the substantially lower price indicative of these "improvements", or are we being screwed ny powertrax and tractec? Anyone care to share the REAL lowdown with the 'average' and some above readers?