Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Watch the vacuum bag blow off! Wear goggles!

I have had a BV2500 for two years If the vacuum bag gets over 1/4 full or the clip type lever gets a little loose watch it the bag blows off and all the chopped up leaves and dust blows right in your face. I complained to B&D and they sent me a new bag. Right away the new bag blew off. They sent me a new improved bag,(it has a black latch instead of orange.) It lasted a little while then poof! it went too. I resorted to modifying the bag with two bolted on "c" clamps screwed on and it works fairly well except it is no longer easy to empty. Also the high speed part of the switch is tempermental and only works 50% of the time.