Instruct: Classify the given Amazon review as either positive or negative.
Query: Not 100% compatible with computers listed!

I got it as a replacement/backup for my Dell XPS M2010 but discovered that while it would 'continue' to power my computer when plugged into an AC outlet, it would not recharge the computer's battery!!! For now, the unit sits gathering dust until something happens to my Dell's original power supply quit on me, then, and only then would I plug my XPS laptop into it just so I could continue working connected to the AC until a Dell replacement power supply arrives; I would only use it for the shortest time possible- and only in an emergency. Buyers Beware!!!