I installed some IKEA bulbs and switches with the IKEA dirigera hub, and had a terrible time. For example a LED strip lost connection a few times, and wouldn't connect on its own without unplugging/plugging.

I replaced the hub with a Home Assistant Green with ZHA, and I haven't had any issues since.

So in my experience each of the devices seem fine over Zigbee, but the hub doesn't seem verify good.