I went for the 500 Mbps connection with two Linksys-WHW0301GC-UK-Velop_UG_LaunchEdition units. I am very disappointed with the Linksys units as they are a really dumb mesh system.

I cannot back up the config, so if anything ever went wrong, I would have to set it up from scratch. My TP-Link router and even my Sky router can be backed up. I Am looking at trying to use my TP-link router to replace the Velop units as I have quite a complex setup with 30-40 devices, fixed IP, port forwarding that takes ages to set up if it ever had to be done from scratch.

The speed is very good, anything connected by ethernet sees the speed at the router, 506 up and 540 down, so pleased with that. Wi-Fi somewhat slower, at 200+ Mbps.