Even though there's a video on the site, it's not clear how the locking mechanism works. What makes these racks better than an upside down U style rack? I know you said that you don't need to carry a U lock, but I think that most people would carry one anyways. What if the racks are all full and you don't have your lock with you? What's to stop an unscrupulous person from putting one of these racks out and keeping a key for themselves, only to steal bikes from it? Do the racks attach to the ground, or could somebody just load the whole thing into their truck? What if a thief were to take the locking bolts in the hopes that a person would not have their own lock and just leave their bike unsecured?

p.s. There's an edit button that you can use to add info to a post without triple posting.