I have had nothing but problems with iTunes Match since its release. Among them: 1) duplicates on my iPhone, 2) smart playlists fine on MacBook but incorrect on iPhone, 3) album artwork missing/incorrect, 4) purchased songs on MacBook not updated as 256kbps (even though I have removed/redownloaded), etc. I have tried turning off iTunes Match on my iPhone, resyncing without music checked, and turning iTunes Match back on...along with many other turn-off/resync sequences. For those that have iTunes Match working flawlessly after running into some problems, was there anything in particular that you did to resolve some of the common errors others are seeing? So far, I have seen no benefits from iTunes Match, only headaches.