I too have myself a shiny new S3, got it 8 days ago and so far, loving it, for about 5 months I was using ICS on my Desire (which was 80% fantastic) and I sort of forgot what it was like to have a really snappy phone haha, I was used to the odd freeze or stutter, so coming to the S3, I got that wow factor all over again... which was nice. Not a huge fan of Touchwiz and they seriously include way too much bloat, even on my unbranded handset, but other than that, so far, can't really fault it for anything
Oh and I got mine from Mobiles.co.uk, T-Mobile (which i've since discovered, seem to have amazing mobile data literally anywhere in the country, odd considering I was on Orange before and it was utter rubbish and they are supposed to use the same network),