Any New Yorkers using Citibikes for daily workouts?

I've been doing it for the past month. I try to get a good thirty minutes of decent cardio cruising up and down either riverfront (about 6 miles) before checking the bike back into the dock. My quads and glutes were really burning and got pretty sore in the beginning, but they steadily got better and I can now chug along at 10-12 mph with a decent heart rate for at least 30 mins twice a day. Having that hard time limit to return the bike is a good incentive not to coast, heh.

The bike is not the greatest fit and with the seat extended to the proper height (about 9.5 inches for me) I have a pretty high center of gravity and my hands and wrists get a little numb by the end of the ride. Riding into the wind sucks with a super upright posture and at 45 pounds with a hub generator it's not very sporty. Getting the beast over 15 mph requires a cadence that's still a bit too high to be comfortable for me. But overall it's been really enjoyable and seems to be quite effective. I suspect the mapmyfitness GPS tracking app often overestimates the calorie burn, though.

Anybody else doing this?