I’ve tried it and have a few thoughts:

Initial selection is only 23 games, not sure why they’re not just releasing everything. I guess they’re planning on parceling the music out like their emulators.

The choices of games are also kind of strange, like why 2 versions of Metroid? Why starfox 64 and not like Mario 64

The ability to extend songs up to 60 minutes is pretty cool

The idea of character specific playlists is interesting

It crashes semi frequently, not a good sign.

It does add value to the Switch online membership, but not much at this point.