Except that it looks like planetary gears don't seem to do so well when putting too much force through the pedals (e.g. when standing up and pedalling hard. At least, that's what I'm finding. I keep losing 3rd and 4th gear soon after mashing hard in any other gear. Later, they magically come back, after making a really ugly noise. Maybe the hub needs some sort of maintenance; another reason to go single speed, besides getting rid of the weight.