I bought one of these several months ago, and it has performed admirably. It's just as good as my original battery when it was new.
This battery almost doubles the runtime. Works as expected... and props the back of the laptop up to a more pleasing angle as a bonus.
This is one of the best purchases I have EVER made. I pretty much wouldn't be able to function without my laptop between school and work so having this battery has been a miracle. It lasts me about 5.5 hours and also doubles as a lift on the back of my computer. This is helpful when the little fans are going so the heat escapes easier.
