I no longer use Spotify, instead going for Amazon HD because the sound is so much better, that being said...
Spotify UI and UX is so significantly light years better than any other music app on the market. Not perfect, but it should be a model for everyone else. Back when I used it, I even liked how they integrated my personal library.
Spotify premium has 320kbp/s as an option. You are not going to hear any difference from that versus FLAC/ALAC/PCM audio. This has been debunked to death many, many times over.
It's definitely better than non-premium spotify, though. Bandcamp is also a good place to find FLAC-quality files and keep them forever without DRM.
Spotify UI and UX is so significantly light years better than any other music app on the market. Not perfect, but it should be a model for everyone else. Back when I used it, I even liked how they integrated my personal library.