I bought these on Aug. 12, 2008, and I've been extremely disappointed with them. They don't work well at all on the plastic clamshells - the blades are a bit too short so it takes a lot of working from different angles before finding one that lets them grab an edge, and then they just don't have the power to cut through the thicker areas. To add insult to injury, they don't hold a charge for very long and they can't be used at all while charging, so half the time I have to put the item aside and wait for these scissors to charge - or just give up and go get the box cutter.