Ehh I guess I'll try it for a few months.
I already had Premium a few years ago, but didn't use Spotify as often as I do now. Back then it came for free with my internet/phone provider.
I still don't think it's really worth 120$ a year compared to the Free version or the webversion, for most people.
But well, it's kinda my standard player atm, as I've gotten too lazy to download new stuff for my library.
The offline storage in just Spotify format is a real let down though. I love playing music on Audiosurf, it's a great way to delve deeper into a particular song, but it can't recognize the Spotify files

There are ways to convert them, but the only trustworthy program out there is another $$$ investment.. or you have to record the sound that your PC plays atm, which is also a bullshitty way of getting mp3's.