Not truly a fan.  This didn't seem so much a "video" or an edited piece to me than it did just a bunch of clips.  I think if you had made it shorter and thus more dramatic, it might have been more successful in emphasizing the skating...ya dig?
I didn't like how, like he said, you constantly cutt off the heads.  For some, it was nice because you had close-ups on the feet and stuff but for most it was just repetative.  Also, on your zoomed-in close ups, it was obvious that you didn't use a tripod - for shots like that, def use one, it helps a lot.
One thing I did like, though, is the fact that you didn't put music in it.  I love the sounds of skating, the click of wheels on the ramps and stuff, and I feel like you brought that out well in the video by excluding music.  
Overall not bad, just some tweaks and adjustments would make it more to my liking.