This is just a quick followup, I bought the digimoto unit, and if everything goes well I will try the dyno mode on a stretch of empty flat road tonight.
I tried using the dyno feature on two runs tonight, I must be doing something wrong though as the runs themselves were very consistant, but the numbers are insanely low. Peak HP was under 100.
p.s. I will try to find time to play with it a bit more this weekend