I use it in addition to my U-lock when I park my bike somewhere I'm less comfortable. It's quick and easy to fit and lock with one hand - just push the button - and unlocking with the key is also really quick and easy. So far, so good. Update - somewhere in six months. I still use the lock, and last week it stopped the "pulling and grabbing" when I parked it by the front door of my boyfriend's apartment for a few minutes. Not a bad spot anyway, and I left the bike in front of the kitchen window (!), but just in case - and since the lock is so handy and easy to use - I put it in the front disc brake. . A couple of teenagers walked by thinking they saw a chance. Heard something outside, ran out - and at least took a picture of them before they left - empty-handed. This lock has simply paid for itself.