Back on topic...
I got my 8-core, 32GB, D700, 1TB SSD in June, and my results are similar.
The nMP looks very cool, is unobtrusive on my desk, and runs completely silent. The only sound from my desk is from the external thunderbolt disk.
The machine is FAST and stable.
I came from running a late-2011 MBP (loaded) in clamshell mode with two thunderbolt displays. Clamshell mode became a little (though not a lot) annoying, and I didn't like the jet fans kicking on whenever doing anything CPU intensive.
I consolidated my setup can run everything on the nMP.
I will say, it's a LOT of power, more than I can use at most times. I can throw up VM's left and right, do my raw photo editing, music work, and all of it barely touches the machine. My occasional renders are one of the only things that peg the CPU, and I'm quite sure I haven't even come close to touching the GPU power.
I do wish Apple had something between the nMP and the Mac Mini. I use enough GPU where the mini's integrated graphics isn't quite good enough. An iMac would be OK, but I didn't really want the integrated display this time around.
So, while it was a LOT of money, I am still happy. And with this much power, I really shouldn't need to upgrade for 6 years, in which time I probably would have upgrade another machine at least once, bringing the cost a bit more into acceptable levels.