I tried a Citibike last weekend and rode in the 1st Ave bike lane from St Marks Place to Central Park. The bike rides like a tank because it's heavy, sturdy, and had responsive brakes. The tough tires and the 3 gears made it an easy ride. The lowest gear would have worked even on the hills of San Francisco! The front LED and back red lights charge and blink when you pedal, which is a nice feature. The bike is free under 45 minutes if you're a member and free under 30 minutes of you've gotten 24-hour access.
After several phone calls, it turns out numerous stations across the city faced similar problems, and the Citi Bike people were working on fixing the issues. They also did not charge us extra for the time we spent looking for a locking slot.
Still lots of kinks to work out, but overall, it's awesome that NYC has a bike share program at all. Hopefully this encourages locals to bike more, which not only provides exercise but is fun as well!
(Image source: Wikipedia Commons)