Top speed so far is 7 miles per hour, which is about as fast as I want to travel on glare ice. Battery capacity is great. I started with 12.8 volts per battery. After playing on the ice for about 45 minutes, voltage was at 12.5V.
I've gotten plenty of looks so far as well. Most people are rather interested in the project, and get a kick out of it. I'm also pleased with how the "ankle" works. Because where the bolt goes through the skate and it is horizontal, the skate blade can pivot up and down a bit. this is especially noticeable on tight turns. It allows that blade to be in full contact with the ice at all times, even while turning and tilting side-to-side.
If this looks like a fun project to you, why don't you make one? Be safe and have fun!
If you like my alternative vehicle projects, check out my blog at http://300mpg.org
For other household DIY, see http://ecoprojecteer.net