I had one and it was nice but I wouldn't buy it again just because I never really used it any more than I used my procal or flashcal and it takes the same amount of time to make tune changes as the handheld unit. I bought mine for the crawl tune to play in the rocks and was highly disappointed in that feature. Having said that the trail dash itself was cool and fun but in my opinion if your not gonna use all the features the handheld units from superchips are just as nice.
My flashcal does everything i was in need of doing. Money well spent. Plus you can upgrade online if you actually want different tunes.