None whatsoever. I have a large mix of zwave, zigbee, and wifi devices all working great together.
I do recommend adding a few of those Iris SmartPlugs around the house because they act as both zigbee and zwave routers, and it WILL make a difference (even with ST branded devices), especially if you don’t have any mains powered zigbee devices in your home. I have several of those too
Those are OK, and there are a few discussions in the Community about them. I personally don’t own any, so I can’t comment other than from what I’ve read. All I’ve ever seen is that they can be a bit flaky with ST. They are wifi and don’t provide any routing capabilities for zigbee/zwave mesh HA networks.
Personally I’d look for other devices in the zwave/zigbee space.
The reason why I like it is because it’s both a zigbee (by default) and zwave repeater (if you need it, but requires a little more set up). There’s a Community discussion about these devices that you can read that talks more about the zwave set up.
It also reports power consumption, so I have these on my TV’s, projector, audio devices, and a couple small bar frigs.