No, it was a lousy deal. You got stuck with 2 GPUs whether you needed them or not, and they were over-hyped for most people's usage, you needed an expensive external housing for supplemental storage, you had the Apple Tax on RAM and the SSD Array, and the 12-core option had very disappointing single core performance.
In contrast, my oMP 12 core 3.46GHz with much more storage, better single GPU performance, better single core performance, very good 12-core performance and more RAM, cost less than 5 grand, that's a good value.
Apple came out with a pretty good pricing as far as configuration. If you don't need a powerful GPU choose the D300 with more cores, Or more powerful GPU's with less cores or somewhere in between.
Single core performance on the 12 core...not much can be done with that. It affects nearly all processors. More cores you have, the lower the clock speed and vice versa. Yeah, I know. Dual 6 cores, but more fans/power/size would be affected.