Total newbie but after my trusty stereo system died a long and agonizing death, I researched and finally bought a Sonos Connect:Amp and some new speakers, and have been trying to decide which music subscription service to buy - MOG or Spotify (others ruled out). I detest (strong word but I do) MOG's UI - it's the so-called "new one", with artifacts of the "old one" hanging around just to confuse people. Even their support team keeps talking about old and new, like I should know what they're talking about. What I do know is that it's clunky and you can't even bookmark/favorite a public playlist. And now they're saying their desktop client won't be available until "sometime in 2012".
I downloaded Spotify last night and what a difference in terms of ease of use. I'll ride out the MOG 30 day Primo trial and tag onto Spotify's 14 day Premium trial and try to do a fair comparison. But even all the talk about MOG's deeper catalog isn't impressing me much. I did a random lookup of 25 classical albums and found only 5 of them on MOG. Not much better on Spotify, but with the far superior user experience, I'm leaning toward Spotify, this after I was convinced MOG would be my choice prior to the trials.
By the way, the Sonos Connect:Amp and Klipsch RB-51 ii speakers are a nice combo for a relatively small space. Sonos's Play3 and Play5 are hugely glorified and very expensive boom boxes, but the Connect and Connect:Amp are nice products. The ease of use ranks right up there with Spotify's UI. Both the Sonos Desktop and Android controllers work great. Off topic, but just sayin'.
