Yeah, it's weird.  Back in March, I started building "The Collection".  Going through all my MP3s, and pretty much starting from scratch.  However many months/hours/gigs later, I've got like 90% of my songs at 320kps, 500x500 (or better) album art, and meticulous (thanks, Musicbrainz!) meta data.  Then Spotify happened, which doesn't really matter for me since they have maybe 60% of the stuff I listen to (no Tool?  No Zep?  No [insert band here they don't have]?) and you have to pay for mobile access.  
I just liked the idea that for every song I "fix", it's, like, done forever.  Archival quality (at least for an MP3), manicured meta-data, and appropriate album art.  That song is done.  But now, apparently, iTunes would have done it all for me.
I could have downloaded just any ol' 128kps encoded file with crap meta-data, used iTunes match, deleted the original, and re-downloaded the better version.
Still wondering if it's worth it for one year.  On the one hand, there are another 250-400 or so songs I need to clean up before I'm "done" with The Collection -- I'm not one of those people who "collects" music.  I really only want things I'm actually going to enjoy listening to, or have some other reason to have (like needing songs for a party mix or something).  Of course as time goes on, I'll want to add songs, but presumably doing it a dozen or so songs won't be as bad as the 1500+ I've cleaned up so far. 
So I have to decide if it's worth $25 for one year to have iTunes clean up those last songs for me.  It probably is, although a surprising percentage of the stuff I get isn't on iTunes, if not being able to download album art is any indication.
Sigh.  Decisions decisions.