We're sleeping so much better with the room mostly blacked out (we also have rear neighbors with bright lights, and cats that roam the neighborhood and set off everyone's motion sensors all night).
Having an exterior covering on the southwest-facing windows has also massively reduced the need for cooling in the summer — our original reason for having the install done.
Our bedroom has ~99% light reduction with the external screens, and our toddler's room upstairs has completely opaque roller shutters and gets DARK, which has made for very easy nap times and great overnight sleep. When we ask Siri to wake the kid up, a scene is executed that rolls up the shutters, turns on the overhead light, and plays a happy song on the HomePod. Always puts him a great mood.
For the more technical they are Zigbee and heard all of IKEA zigbee stuff works without the hub. I personally have had issues with HomeAssistant and Tradfri integration so just use the IKEA app and the hub with no issues for over 6mo now.
[1] - https://www.ikea.com/us/en/p/fyrtur-black-out-roller-blind-s...
Only small issues I've identified are that 1) Zigbee meshing doesn't seem to behave with these, so you'll have to pair the blinds directly to your hub. This is fine, as long as your place is small enough for there to be no signal quality issues. And 2) if Home Assistant instructs the blinds to open to a specific position (i.e. "80% closed") rather than fully open or fully closed, it can take a really long time for the blinds to update the hub with their state. This means they show as "opening" in the HA UI even though they're finished moving.
A little pricey for what it is, but it is really a no-brainer when you think of how crucial restful sleep is.
The same thing makes all kinds of sunrise/sunset home automations completely useless :D