Instruct: Classify an Amazon review into positive or negative sentiment.
Query: Work Great! Until they break.

I hate leaving a negative review for these. I have had them for over a year, and I liked them so much that I got my Dad a pair. Unfortunately, his broke immediately. I wasn't sure what happened, but the image was misaligned, so you couldn't focus on anything. I assumed it was a fluke. He sent them back under warranty and they sent him a new pair (for a fee, not sure what it was).Turns out it wasn't a fluke. I dropped these about about 2.5 feet in the case recently. I didn't think it was a big deal, although I never want to drop a precision instrument like these. I look through them, and they are misaligned. My conclusion is that these things are just not durable. Any abuse and they will break.They work beautifully until they break though.