I use that laptop
I've completed the game with it. As long as you haven't moved from a gaming computer to this you won't know what your missing out on. It is pretty good for it's price and there are a few games you can play with bearable fps.
On amnesia I got a steady 18-25 fps all the way through with all settings on medium, however on justine this was a little lower, and on some custom stories it can be considerably lower. (sometimes >10 fps)
The biggest problem I have had with it was overheating when playing Justine, but that was in the summer and the air was really warm at the time anyways.
I'd suggest getting it if you only want it for amnesia and other easy to run games, but if you want to start getting into PC gaming and playing some new games you will find yourself wanting an upgraded computer pretty soon.