I built mine using an older Ultegra 1x11 mechanical shifting setup. The only issue I encountered was with the front derailleur cable. I had to file down the frame slightly for a better fit. The rest of the cabling went flawlessly. The handlebar was a bit fiddly, but with the help of a special routing tool, it was manageable. Shifting performance is quite good, and I didn’t notice any difference compared to non-integrated cable routing.