I bought over a year ago...used it to commute, bomb (38 mph), barefoot cruise, parking garages, and to chase off a dog chasing me on a couple rides...
It allows your to pump at speeds faster than you can with a foot, pump as you corner, bleed off speed or stop as needed, and is great on helping beginners learn.
Two tips...
1. Lots of upper body stretching, you most likely are not used to using the needed muscles during skate sessions.
2. Consider some fingerless gloves...I got blisters the first couple of 4 hours sessions.