Just got the mw6 set from AliExpress. Using only 2 with wired backhaul for the 2nd one. Both are upstairs. Getting 160Mbps+ in the lounge which is actually one of the worst areas. I use Plex with 4k rips so speed is important to me even if my internet is currently only 30Mbps. I paid £109 for the 3 so if I can eBay one for £50 I am laughing. For most the MW3 is ample though. In my 4 bed house with a concrete dividing wall 2 units were enough. Maybe 3 would have been better if I didn't have wired backhaul? I would recommend these but think of the mw6 would suit you better? I'm soon to get 300Mbps fibre to the home :) Also, appears as separate SIDS to my TV although that in itself isn't an issue, dodgy TV firmware. Roku also was a bit odd with it but working fine at the moment. Not sure every device is as mesh ready as one would hope.
See my post above about the biggest limitation, the other differences I don't think you'll notice in a normal home setup or really need tbh unless you have a lot of active (heavy data requirement) devices being used at the same time.
How do this rate compared to the BT Whole Home system?
These won't go past 100mb if your okay with that it seems okay value
Spap.....snap? Where the fek did spap come from :/