I hate to say it, but this thing is a joke compared to other workstations on the market. Dell and HP have machines scoring 40,000+ on Geekbench. And only 4 memory slots? Many other workstations have 16. I either spend a fortune with 16 or 32GB sticks, or am limited to 32 GB in 8 GB sticks. Pair that with special graphics cards, a lack of an optical drive, and a slew of other limiting factors, and this thing begins to look more and more like a toy for people who think they need a Mac Pro, but really don't. It'll be fine for basic design, but not too ideal outside of that.
Sure, I can buy a bunch of crap to hang off of it with Thunderbolt, but it's a shame that Apple relies on outside manufacturers to make their product what it should have been to begin with. And not to mention all of the added cost.
The only thing better about this from PC workstations is that it's a Mac.