Yes, got three IKEA Tradfri Signal Repeater E1746 acting as act core of my Zigbee “backbone network”.
I highly recommend them. Personally, I have a two-story house with a basement and an attic so have hidden one each in the middle of the house on each floor that does not contain the Zigbee Coordinator.
+1 but if you have a larger house with radio killing building obstructions/materials and do not also have other devices that act as Zigbee routers, such as Zigbee plugs, then consider dedicated router devices.
IKEA Tradfri Signal Repeater E1746 works great as Zigbee Router, however, the IKEA Tradfri Wireless Control Outlet (IKEA’s smart Zigbee plug) does not work good as a repeater, but yes it is also a router.
They both work OK as Zigbee routers for battery-operated Aqara, Xiaomi, and Tuya sensors, but as mentioned those an infamous for being incompatible or losing connection with most Zigbee routers.
I instead recommend ITead’s Sonoff Zigbee sensors even though their enclosure looks is not as good:
https://itead.cc/?s=zigbee&post_type=product&type_aws=true
Check out for example this review:
https://notenoughtech.com/home-automation/best-zigbee-temperature-sensors/
The general recommendation is actually not to use Zigbee lightbulbs as Zigbee routers because they are often installed within an existing light/lamp fixture with a manual switch (wall switch or cord switch).
It is therefore common that some human comes along and simply flick that switch and it loses power.
Zigbee router devices are meant to be permanently powered devices that are always on.
For this reason, some smart manufacturers of Zigbee lightbulbs have chosen to configure their firmware as an end-device instead of a router in order to avoid bad experiences to prevent the wrong usage.
PS: Personally I only use Zigbee lightbulbs in my window-lamps/window-light fixtures and for those, I made sure that they are always permanently powered by physically removing their cord-switches. As for my ceiling lights/lamps I only use relay or dimmer modules connected controlled via existing wall switch.