I have 2 big issues with it:
1. I can't just put songs from my computer on my iDevices now, I have to download them from Match instead. This brings me onto point 2...
2. If I create a mixed artist playlist from tunes downloaded via Match, the volume of said tunes is all over the shop. You get loud one, quiet one, nuvver loud one, REALLY LOUD ONE, quiet one etc, etc. turning on the sound check thing does feck all.
I shan't be renewing my subscription next year, as I've already turned it off!