Vincent Laforet used an iMac Pro for a week. He likes it.
I found a very consistent set of results: a 2X to 3X boost in speed (relative to my current iMac and MacBook Pro 15”) a noticeable leap from most generational jumps that are generally ten times smaller… I’ve seldom seen a jump this dramatic before on any new generation of Macs – 20%-30% speed increases are the norm … NOT 200%-300% increases. That’s SIGNIFICANT.
Craig Hunter got one, too.
I was able to get some limited data on a 2017 iMac with a 4.2GHz quad-core Core i7 processor, and while that machine is slightly faster than the iMac Pro on single-core, the performance flattens out with more cores and the advantage is gone by 4-cores. From 4 to 10 cores, the iMac Pro runs away.
Just be careful that your wallet doesn’t catch on fire.