Instruct: Classify a given Amazon review as either positive or negative.
Query: Frustrating to use

I know how this lock is supposed to work and have gotten it to lock before, but it is so frustrating to use. I just spent 20 minutes wrestling with it, trying to get it to lock, with no success. Part of the lock is too loose to ensure that the lock securely locks the laptop. If you have a USB device plugged in, or if your laptop is angled such that it's facing you, the lock placement is awkward as well.