Finally checked out the B-Cycle yesterday. A beautiful sunny day and a breeze made the ride even better. We rented at James Madison Park, but really should have rented at the Union as we had planned on biking around the lake.
We ended up just riding the bikes over there, which made for an interesting ride as it was move in weekend.
Overall, it is the easiest experience. You just put your card in to pay, and then you have a certain number of seconds to go grab your bike. I will say that the bike is in fact extremely heavy as others have mentioned. But, once your off and pedaling its great.
We ended up returning our bikes at the Union and then just wandered back down through State Street. Overall, this is a great way to see Madison even if your local. A fun and reasonably priced afternoon activity.