just means you only can increase the rear wheel's momentum with the pedals and decrease wheel momentum with brakes. you can't increase backward momentum with the pedals either.

people act like that's big deal but it's really not, especially because WHY WOULD YOU WANT TO GO ANYWHERE BUT FORWARD ON A BIKE????

i have right now three bikes; fixed, ss, and geared.

i'm selling the ss, but that's mostly because it doesn't fit me. i like the other two more- if i'm going to coast i'd like gears so i can get up to speed and then coast when i'm going faster than anything else on the road. and even then, i hardly ever coast on a freehub bike anyway.