Instruct: Classify the given Amazon review into positive or negative sentiment.
Query: worst ups ever

Today Black out because of massive storm sandy.My generator is working now.4 CyberPower UPS all down. (bought these in 2008, 2010, 2011, 2012) - no idea why it doesn't work after 2~4 hours.2 APC UPS all down. (bought these in 2009, 2011) - it was died as soon as black out. worst item.ULTRA UPS works fine. (bought it in 2010) - Recommend this.Belkin UPS works fine. (bought it in 2007) - Recommend this.