At least Apple finally decided to equip Mac Pros with workstation GPUs. That's the only positive thing I have to say about this generation.
The actual choice of GPU is terrible. AMD FirePro only bests the Nvidia Quadro for CAD/CAE. For all other industry-standard applications, Nvidia Quadro reigns in performance. The worst part is that even if I want to connect an Nvidia Quadro, Nvidia Tesla, or Xeon Phi, I have to do it through a Thunderbolt 2.0 Chassis, which is bottlenecked to a measly 4x PCIe 2.0.
Apple is just parading the spec without thinking of the customer, and claiming it's designed for a wide-array of industry apps. The only upside to this is that there are two of the AMD GPUs, but all this really allows for is more, larger screens (inter-GPU communication has never been good). In reality, this is just designed for small- to medium-scale 4k media creators/editors. It reminds me of when Apple paraded the rMBP for CAD despite it not having a mobile workstation GPU.
With two workstation GPUs soldered into an in-house chassis, the pricing is going to be sky-high. At least having only one CPU should bring down costs, but 1866 MT/s ECC RAM isn't cheap, and Apple already overprices RAM as it is. Not to mention the worst component of all – the PCIe SSD. eMLC NAND costs a small fortune, and if it isn't eMLC, every customer with a heavy workload will avoid it like the plague.
The cost would have been excusable if the performance was decent, but with 1.25 GBps Sequential Read and 1.0 GBps Sequential Write, it sits at the low-end of the PCIe SSD market. Even my MLC SSD RAID 0 array pulls around 1.8 GBps for both Sequential Read and Sequential Write. At least Apple provides Thunderbolt 2.0 ports, that's the saving grace for storage (provided they implement the controller correctly for heavy load).
And finally, there's the "innovative" cooling solution. With vents placed all around the circumference of the chassis, how is one supposed to position this machine without obstructing airflow? Does the single large fan on the top of the chassis not scream "SINGLE POINT OF FAILURE" to anyone? (Even high-end fans have a lifespan of 50,000 hrs.) What happens to temps when both GPUs and CPU are under heavy load?
It's ultimately a niche product for an ever-dwindling niche market of media professionals.