Instruct: Classify the given Amazon review into positive or negative sentiment.
Query: WTF is up with this laser sight?

I just got this laser sight and a pressure switch for it yesterday, and it didn't even last the night. I couldn't figure how to adjust the dot to be perfectly aligned with the iron sights on my airsoft gun. It took me like 5-6 hours alone just to try and figure out how to line it up, but not even close to perfectly. To top it off the laser dot was like a big blurry circle, though I think that's just defective, so I'm returning it for an exchange to see if a new one works any better.