I've been using Mlem via TestFlight. It's solid. My only gripe is minor. I see a large amount of duplicate posts across different Lemmy instances. For example, Beehaw's c/technology and Lemmy.world's c/tech often have the same content posted. My guess is it's the nature of federated content. It'd be very impressive if you find a solution to consolidate duplicate posts from Lemmy instances.