Only have an anecdote, but when I replaced my latest (last?) generation Apple AirPort Extreme with a trio of Eeros for a ~1700 sq foot two-floor house I immediately wished I'd done it sooner.

Expensive for sure, but setup was a breeze, reliability has been great, and I get 200Mbit+ a floor away from my ISP router, where I used to see 20 on a good day.

I was skeptical of how well a mesh could work, but the performance has sold me.