I dont know if this is going to help anyone, but I've been playing with the service all night and these are some things that I feel are unclear that need to be cleared up
-There is a 25,000 song limit, but no space limit. I've got 40GB that didn't match (4,000 our of 15,000 songs), and it's currently uploading. I think many people assume that the 5GB iCloud limit counts and that you will have to purchase more space if you have more than 5GB that needs to be uploaded. This is not the case.
- Whatever metadata you have for a song is what is copied. For instance, iTunes 'matched' the Metallica song "Nothing Else Matters" which was in 96kbps. I promptly deleted the original, but the song stayed and a button appeared to d/l the 256k version. My original file didn't even have the artist name, only "nothing else matters" in the title portion. Upon d/l the new file all metadata stayed exactly as it was. Very few files in my library have such relaxed metadata, but I think it's amazing that iTunes is able to recognize the file either way.
- The process took my library (15k songs and 120GB) roughly 5 hours to scan and match. It's still uploading, and I expect it will be for at least a day or so even though I have a fast connection. The servers are slammed.
- I haven't used it on my iOS device yet, but I imagine it'll work just fine
- I've already upgraded a ton of old files, even old DRM protected iTunes purchases from 7 years ago. It's already paid for itself
- I love how on my laptop, i had a farily empty library, but as soon as I turned on match on the laptop, all of my files from my main library appeared (except the one's still uploading [those show faded out and 'waiting']). All the playlists appeared. If I add a playlist to the laptop, it gets auto added to the desktop which is my main library.
This produce in my eyes is truly incredible! Once all of my filed upload I'll never have to worry again about losing my music with a failed hdd or not having a song on my devices or computers. it is seamless and perfect for keeping everything organized. The playcounts and ratings, etc all transfer as well. It is as if you have only one library, even if you have many. It is truly incredible and I would expect nothing less of Apple.