I’ll wait till NI addresses the whole taboo of synced iTunes smart playlist before tackling bigger problems.
But seeing as match’ll only replace files I delete, I think I’ll give it a try.
Ah look at this.
I think anyone who relies on iTunes for their Traktor/Serato/whatever connection should definitely hold off for now. Imagine if you replace a track and your DJ interface resets the grid/cue points, 
I would be grateful if anyone could actually try and confirm this.
As I live in Germany and despite iTunes to its fullest I already have two reasons not to stick any cash into Apple’s arse.
just read the following news. iTunes Match only analyzes the first 17 seconds of a track. if it finds a match over those 17 seconds, the only other criteria it looks at are whether the length of the track is approximately correct and whether the metadata is roughly appropriate.
scam potential galore. download a 30s song preview (the preview has to start from the beginning of the track), fill up the length of the track with silence. encode at >=96kbps, fill in some metadata, and add to your itunes. voila! or, even easier, download the track off youtube, encode at >=96kbps, put some metadata, and add to your itunes.
Appleupload, so to speak 