I commute primarily on my Cross Check. However, I have two Bike Fridays (a Model T Tikit & a fixed gear Pocket Rocket). As far as speed, it depends on the folder. My Pocket Rocket is a road bike & very very fast. The Model T Tikit not so much. I have a 30 mile round trip commute & the time difference doesn't vary significantly between which bike I ride. It probably varies just as much depending on how tired I am rather than on which bike I'm riding.