my experience tells me that they are absolutely not reliable, any brand.
the only thing that really works are mesh routers, and you should stock to the same brand if you don't want any trouble.
have good results with synology mr2200 and mr2600
( RL:
bold added )
Trouble is, it appears to me every manufacturer has their own definition of "mesh routers", and your ISP has some say in which ones (manufacturer/model) you need to be compatible with their stuff.
This experience was days under a year ago, things may be better now: Then, I was helping a relative setting up the ISP/WiFi. The ISP's modem is equipped with WiFi and "mesh WiFi network". Looking at their website at the time, they just mean multiple AP's (access points) with same broadcast names. In practice, switching from a weaker (say bedroom) to the stronger (kitchen, now you are there) is entirely up to the device you are using. If the bedroom's AP signal is weaker and thus slower but it is still strong enough not to loose signal, it will stay latched on the weaker bedroom WiFi AP. Only by turning the device's WiFi off and back on would it find the stronger signal AP.
Besides, a weaker signal but directly connected may still be faster than a hop thus with extra latency -- after all, your local mesh-based AP will be using that weaker signal for back-haul if they are not hardwired to the router. In theory, that local AP should be best positioned to have best connection. In practice, that doesn't work so well. I was testing download speed using various internet download speed tests. Direct connect (with weaker signal) vs nearer AP with WiFi back-haul: The direct connect beats WiFi back haul every time, at least in that experience.
Looking for better alternatives, we went shopping. While shopping at Best Buy, one manufacturer has sales posters that merely described their "better than traditional Wifi new mesh Wifi network" as "aesthetically pleasing" so it doesn't have wire all over the place connecting black boxes with big transformer power plugs as compared to "traditional WiFi" -- that's it, it was merely a better looking box that you don't have to hide. They may have better sales posters now, but that doesn't give me much confidence.
The ISP (and the ISP's modem) has been replaced twice since. I am not sure how the ISP's tech set it up anymore. I stayed away at arm's length so I don't need to be the volunteer 24hrs tech-support.