Any bumps on this product ?

And I'll copy and paste what I've asked elsewhere..

RL VBox, Performance Box, Sport, Mini, Maxi, Allegro...WTF

Many people are using these, but they seem to have a huge array of these units available ?

The new Sport says 20Hz GPS which is bound to be good, but almost reads as if you need an Apple product to make full use of it.
Hardly a budget deal

Mini seems to be double the price of a Performance Box, and looks the same ? Seemingly most of the difference is just the VBox Tools software ?

Is hardware same ?

What are people using, positives and negatives ? Software all good or lacking in some areas ?

Is the Mini worth paying double over the Performance Box for example ?