Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Bulletproof

I am using one of these pumps for my wood fired hot tub and have been for three years straight. I bought it used off Craigslist as a temporary fix while I shopped for a big one. It worked so well I never bought one of the big $300-$700 models. It runs on a timer every day for 4 hours and does a great job. What is most impressive is that it has lasted so long and taken such abuse. My tub is in the woods below a bunch of cedar and fir trees so it gets tons of junk in it even with a cover on. I've even drained the tub several times for cleaning and forgotten to tun off the timer so the pump has run dry for hours, fill it up days later and it pumps away. In winter it has frozen solid, thaws out after a few days and keeps on ticking. It's finally getting loud so before it fails I am going to replace it. With a little less abuse I'm sure it will last a very long time.