Seriously, a rear brake, and some decent tires. I agree with the people who said foot retention, I mean, on a machine like that I just can't understand why not, but I'm willing to let that one go since it isn't strictly necessary, just a really good idea. Hell, I'll even let the tires go, but I don't get the lack of a rear brake. But nooooo, Mr. 20-years-of-bike-experience doesn't want to hear it.

Also this quote from page 2 is just too funny at this point:

fail