I have 8 Z-wave devices now, including a couple "long range" devices. With the first couple, I would sometimes have trouble with the farthest, battery-powered device dropping out of the network occasionally, but that hasn't happened as I've added more devices. I fought with pairing the initial devices - clicking the right series of buttons at the same time as telling HA to look for devices to join - but all the recent devices have just has a QR code - scan it into HA, and the device just shows up when I turn it on. I don't know how much of this difference between new and old is my learning curve vs better product support, but I am really happy with my Z-waves now.

Z-wave rather than wifi so I know they aren't phoning home.