I've had no issues with cables. I was concerned about the length of a couple of them as my cabinet has OG, 360, One X and Series X running to the I/O box at one far end. I had heard that full chroma might not be possible if the cables are too long, but all good thankfully!
The switch does what I need. I am using it with the 360 and One X...the One X capable of 4K@60Hz and HDR as you probably know, and that all works fine. It's a neat little unit and a very nice design. I am also using it without USB power - it has a lead and input supplied - the switch draws power over HDMI and used as a switch in this configuration does not need the extra juice according to the manufacturer and that turns out to be the case...
It claims to perform above those specs too, I believe. Specifically at 4K@120Hz and VRR support as with full HDMI 2.1 but I leave that dedicated port on the TV for the Series X with my setup.
I would like to say I mighty impressed with the Make MHz HDMI+ Kit in the OG. It gives an amazing result. I can handle a bit of modding but was freaked out by the micro soldering on the cable, haha. A recommendation for Jack at Retro Modz UK who did some amazing work on the box and HDMI install.