I Intentionally looked for "mistakes" with this laptop, given that it's used. I spent about 30 minutes, thoroughly inspecting every inch of it and found a total of 3. All completely aesthetic, and not noticeable unless you look for them. As for it's performance, the laptop runs incredibly. I really only get up to a max of around 30% CPU usage. Sadly, as expected, the battery kinda sucks and it only lasts maybe an hour and a half to two hours. It's totally fine though, I just use it plugged in. All in all, I am more than happy, and blown away by how much money it DIDN'T cost me. :)