Instruct: Classify a given Amazon review as either positive or negative.
Query: broke within first 2-3 hours of usage

I dont like writting negative reviews, but i have to be honest so people know what to expect.I bought this unit for small demolition work in my house, demolishing and old wood lath/plaster wall. The filters clogged up relatively fast when working in highly dusty environment (not the issue by any means, cleaning it brought me back into a working state). Disappointing part was that the piece that controls the band on how tight you want the mask to be on your face broke - within 2-3 hours of usage. Since i had to continue working and had no backup mask, i tied the tightening band around the area next to a filter. It got me through the day but i was disappointed. I dont know how much it would cost to make plastic tightening clip a little more sturdy - but it definitely worth spending few pennies just for this purpose.