I feel it is pretty much uncontested that the 2013 Mac Pro was not a successful product for Apple, nor adopted well by previous Mac Pro customers. I have a 2012 Mac Pro, dual 3.06 Xeon processors and an upgraded GTX 980Ti and 128GB of RAM. I feel this could be my last Macintosh desktop unless Apple puts a product out there that I would actually be excited about purchasing. While the 6,1 would be a "neat" product to have, it does not meet my needs for upgradability. The reason I do not want to leave the Apple platform is the same reason almost everyone else does: OS X. If Apple would launch a new workstation targeted at workstation users, with current technology, several PCI slots, tower form factor, several internal drive bays with SAS support, current Intel Xeon options, tool-less tower design, and even a new, alternate version of OS X that is specifically designed for professional users (similar to the way Windows 8.1 and Windows Server 2012 R2 relate to one another) with a dedicated support department and five year warranty options, I really think this would be a home run for Apple. The OS stability is currently there, with uptime measured in months other than needing to restart for updates, and the new file system is around the corner, this could be what the professional market is looking for. I don't feel Microsoft stepped up to the plate with Windows 10, and the reason it has been as successful as it has is that it was free for most users. Windows 8 flopped, Windows 8.1 did slightly better, and Windows 10 has massive privacy issues. I feel this is a chance for Apple to release a product that would satisfy the pent up demand that professional users are looking for. The HP Workstations and Dell Precision workstations are great, but they are stuck running Windows or *nix with few professional application options compared to OS X. Windows is fine for corporate users, but for workstation users that rely on media creation, iOS coding, virtualization, and other RAM and processor intensive tasks, an internally expandable Mac Pro running a less "consumerized" version of OS X I think would really be a hit. And it would be trivial to include options that current Mac Pro tower users have learned to do without - Thunderbolt 3, USB-C, USB 3.1, etc. Are others seriously considering leaving the platform when the 5,1 reaches the end of its useful life, or would you consider a 5k iMac? I still have several Macintosh notebooks, but with the lack of upgradability spreading like cancer in their Macintosh products, I am not sure how much longer I will feel it is in my best interest to continue purchasing them.