I just gave up on Apple ever shipping you are MacBooks and received my custom order HP two days before they announced the October 27th event. My (magnesium unibody) ZBook is as slim as my retina MBP, has a higher-PPI display, also comes with a glass trackpad, has user-replaceable battery, 2x M.2 PCIe SSDs, and upgradeable ram. I was able to pay a bit extra and get it with a mobile Xeon CPU (E3-1545m with Intel's top-of-the-line Iris Pro integrated GPU) which is the equivalent of the i7 6920HQ only with more cache and better graphics, meaning I was able to buy 32 GB of ECC RAM for only $200. It has a 4GB nVidia Quadro and still manages to weigh less than my rMBP.
The only thing that sucks is the noise. It's quite even with the fan running at its highest RPM, but the frequency of the resulting noise is very distinguishable and it has a tendency to rev up and down quite suddenly (and often). It doesn't help that there are two fans, one on each side, which turn on and off independently - meaning you can suddenly feel like you've lost hearing in one of your ears until you realize the noise level is imbalanced. I don't know if Apple will introduce Xeon workstations, but even if they did, I'm not sure I'm ready to give up my three USB 3.1 (non-C), three thunderbolt 3 (/USB-C), power, gigabit Ethernet, and 3.5mm ports in exchange for a more-pleasant audio profile.
Did I mention I've been a faithful Mac user for over a decade?
The only thing that sucks is the noise. It's quite even with the fan running at its highest RPM, but the frequency of the resulting noise is very distinguishable and it has a tendency to rev up and down quite suddenly (and often). It doesn't help that there are two fans, one on each side, which turn on and off independently - meaning you can suddenly feel like you've lost hearing in one of your ears until you realize the noise level is imbalanced. I don't know if Apple will introduce Xeon workstations, but even if they did, I'm not sure I'm ready to give up my three USB 3.1 (non-C), three thunderbolt 3 (/USB-C), power, gigabit Ethernet, and 3.5mm ports in exchange for a more-pleasant audio profile.
Did I mention I've been a faithful Mac user for over a decade?