Well after around a week or so of the Genius option, i finally turned it on & let it scan and upload my stuff to Apple. Some might say that's a stretch too far already! LOL!
However.... it's quite good actually.
On the one hand it's suggesting a whole bunch of tunes that i have but have never really paid much attention to, and i'm finding hidden gems that i didnt know i had.
It is also suggesting some itunes tracks to buy, and yes it is a bit of a marketing gimick thing, however that also has been quite interesting, again i'm finding some quite obscure stuff (well, for me at least with my seeming middle-of-the-road tastes! And i thought i was broad minded!).
I'm impressed, and i have to admit that i've dedicating quite a bit of time trying to get my head around the various algorithms that must be at play here.
It looks like some of it must be based on playlists that people have made, and probably in part based on ratings given (perhaps by me, probably by others too). Looks like clever stuff.
Well done the bods at apple, someone's done their homework and it's all good so far.