Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Still working perfectly more than 4 years later

Purchased 2 of these in March 2008. I especially liked the fact that it has an AC power booster built in to it so that all the USB ports can operate any device. It is now one more laptop and 4-1/2 years later and these USB hubs continue to work perfectly. A great buy on a quality product - it doesn't get much better.