That has been our experience with a fleet of the original eeros and, for the past year or so, eero 6s. And that's in a relatively large urban home with many devices and lots of nearby networks. Our setup currently uses a wired backhaul, which helps with speed, but the wireless backhaul worked pretty well, too.
Also, for what it's worth, no hardware issues across the 8 or so eeros total (1st gen and 6) that we've had.