If we had known about its existence early on, maybe we wouldn't have the problem we are facing now because the children are uncomfortable because they can't take off their belts.

I recently bought it for my 2-year-old son. We have the Kikka Boo 4 Fix 0-36 kg Car Seat. Personally, I am very satisfied so far. It is the best and fortunately worth its money.
Update 6/8/22:
After several rides and trips, I have to say that our car seat is finally loved by the child and he can take his hands out of the belts again

Very good!!! It holds effectively... However, put it on the child early to learn it... We, because we did not know of its existence and for a while he would take his hands out of the belts, now he screams when we buckle him up because he can't take the belts off his shoulders...