Summary: Do yourself a favor and buy something else
Comment: I'm on Amazon to return this product right now. The key is very fickle -- I can only get the darn thing unlocked 1 out of 20 turns of the key. There might be a trick to it, but I don't know what it is. Also, as far as I can tell from reviews (that I should have read), these things do not keep your bike safe!
Summary: Not great
Comment: I bought this lock at Walmart a while ago to lock up my bike on a University campus and around. I didn't get my bike stolen like some of the other unfortunate reviewers (probably because my bike just wasn't worth it), but I do still have some complaints.
First of all, I didn't want to use the bulky LED key, so I used the thinner one. This was a mistake. After about a year of use, the lock became rusted and stiff, and after a few months of having to push the key hard and jiggle it to turn the lock, the key casing just broke right off: it's not metal all the way through, and the "head" is just plastic. So, I not only had a really hard time turning the key without a head, but I had no way of securing the key to a keyring. Long story short, it's a miracle I didn't lose this stub of a key for the remaining 6 months of use, and it was a major pain besides.
If you have a cheap bike or live in a low-crime area, get a better cable lock for the same price. If you have a nice bike, buy a better lock.
Comment: I have no idea how this lock has any stars. The only thing it has to offer is that it is cheap. My bike was stolen right off my balcony in the middle of the day, while I was out doing some community service of all things. You might as well put a sign on your bike that says "steal me" if you use the bell lock. Once I get a new bike, I'm going to get a Kryptonite.
Summary: Great lock, good price!
Comment: I bought this lock for my bike, and I am very happy with it. It is big enough to lock my front tire and my frame (but not the back tire). I like that it comes with an extra key as I am prone to losing things. The lock also comes with everything you need to mount the lock on your bike frame.
Summary: incredibly weak
Comment: my bike and my girlfriend's bike were next to each other, locked up, outside of my apartment. mine had a kryptonite u-lock, hers had this one (the bell hands off bike u-lock).
we went outside and he bike was gone, mangled bell u-lock left on the ground. my bike was still there, but the u-lock was slightly bent.
the thief obviously tried to get mine, couldn't do it, and went to hers and had no trouble at all. i definitely DO NOT suggest this lock at all if you live in an area that bicycle theft is a problem. FYI - i'm in chicago, so it's not like this is a rare occurrence, just keep it in mind.