I absolutely HATE the touchpad on this model. I hate this so much, this is the single and only thing on this notebook but enough to make me want to throw this model out of the window. I got this assigned at work and I didn't have choice. To be honest, if you can go with the 520 model (older with classic touchpad) go with it. The older touchpads were excellent, although smaller because needed buttons, this touchpad is absolute disgrace and total monstrous crap!! It feels like rubber, wacky, noisy, hard to press, imprecise, drifts away, choppy, clicky ..... I am using mouse all the time. This is total embarrassment for Lenovo. I hate this so much every day that I dread when I have to touch it, I wish the machine just dies so I can get a new replacement different model.
Fan issue - I also noticed the pulsating fan and also have from time to time the "Fan mulfunction" when booting. Heck, I don't care, that's minor compared to the stupid trackpad. If the fan mulfunctions, at least I get replacement. ... Yadada sorry for being a troll, I just had to let this go or I will rip it apart this touchpad.