I bought this laptop as it promissed superb performance for 3d content creation and my experience with HP Elitebook 8770w which I was using before was just great.
After using this G3 for a few months my experience is kind of mixed bag. Performance wise, HP delivered and I am satisfied. What am I quite unhappy about is the build quality. I have spent over 4000$ for this machine at that time but the make feels, well, cheap. The elitebook I have owned before (with the price considerably lower) was far more superior in how it was put together and what materials were used. I was expecting something on that level which I definitely did not get. I am concerned especially with: casing doesn't feel very firm. used material is plastic that make sqeuaking sounds occasionally and feels like it could break quite easily. then something I have seen on low to mid-class laptops only: you can hear internal fans interfering with a sound card. or at least it sounds exactly like that. very annoying. keyboard and overally all buttons are just... meh. there is nothing terribly wrong with it but again it feels quite brittle and quite cheap (again, compared to my old HP elitebook or macbook).
build in speakers are one of the worst I have heard on any serious laptop. that is not for the account of build quality, neither I bought this laptop to have a great speakers but it is just another thing that feels very cheap about it and sometimes I must use earphones only to hear properly what somebody is saying when having a skype call for instance.
otherwise, the laptop is fine but the build quality is dragging it down and I was very badly surprised about it, given the price tag. hard to say how come no review I have read before buying seemed to be seriously bothered by this. next time I will never buy a laptop without being able to physically touch it before.