I will say it's fast.
My complaint is the Thunderbolt 3. It is a lie. First you need an adapter because of course you do and the only one at the store is Apple's. I have a bunch of Macs and displays and peripherals and zero success talking to any of them.
I don't know if I'll even complain. I have an Intel desktop mobo that after several years learned to drive a display over Thunderbolt iff it's connected on boot and that's all. So I'm not expecting much.