I bought the 46T36T version to replace a SRAM crankset and was immediately impressed by the improvement in front shifting. Everything else in my SRAM 10-speed drivetrain was unchanged, so the improved shifting can defiinitely be attributed to the Shimano chainrings (which have a reputation for being stiffer than SRAM)...Installation was easy. You'll need a Shimano bottom bracket, but those are cheap and sturdy with good weather-resistant bearing seals. Lastly, the Ultegra 8000 asethetics are mint clean lines, muted dark gray finish. I actually think this crankset looks nicer than its much pricier and only slightly lighter Dura Ace 9100 cousin.
Pretty sweet crankset if you race cyclocross. This is my second crankset of this size, I put it on a road bike that I built for my coming tour that involves a lot of climbing. Shimano only made this teeth count combination for Ultegra, but the rest of the group is DuraAce. So far, it perform exceptionally, crisp gear switching and lightweight. The new version (R8000) is good looking too.
Maybe a tiny bit less stiff than Dura Ace . But so solid, smooths and ready to go. Snappy in acceleration and spins for days. I am sure that if you are looking to find the difference between this and dura ace you will find it . but you have to really look for it.