I have an Orbi router with an extender and it works quite well. Before that I had an Apple Time Capsule and used an Airport Express as an extender and that worked well too (although not as well as the Orbi). Any extender’s reliability is going to be based on its position relative to the main router. If there’s a weak signal coming into the extender, there’s going to be a weak signal being broadcast from the extender. I recommend experimenting with the extender’s position in the home until you get the results you’re looking for.