So far , so good! I received this 2 days ago and have been checking it out.  It came with all the advertised specs being fulfilled. What I have found is that the 3.4 ghz processor is running between 3.8 and 4.0 ghz. I did nothing to optimize this. Something not mentioned in the specs is the machine came with a DVD/CD drive which is mounted vertically in front.  What I have noticed is that a couple of the USB 3.0 ports do not seem to be backward compatible with USB 2.0. Also the ethernet the RJ45 jack seems to be not working.  This is not a concern to me, but is the reason for the 4 rating.