Amazon Launches Lossless "Hi-rez" HD Music Service

just started my free trial--initially i find the UI inferior to and less intuitive than spotify but better than tidal. catalog seems deep, if not as extensive as spotify. ultra hd sounds great; hd sounds better than spotify, though it's not a night-and-day difference and there's less ultra hd content than expected. playlists are ok, though not as well-done as spotify--i expect they'll markedly up their game and add content as they gain traction, since amazon is very customer-focused and has long-term vision on their road to world domination.

the great thing about spotify is its discovery algorithm--it's uncanny how accurate its recommendations are. amazon's is primitive in comparison, although i notice it gets a little better the more i listen to the app. also, whereas spotify has radio stations for every artist, amazon has very limited stations. amazon does sound better, but at the end of the trial period, it may come down to how hard i want to work at setting up my play queue.
speaking of which, is there a function on amazon which continues to play similar songs after a queue is finished?