Heard lots of bad words about the mechanical quality of Sigma-Lenses. And yes, i have owned one (50mm EX F2.8 Macro) which was very poor in any aspect. I do still have the 105mm EX F2.8 Macro from Sigma (got full refund on that crap-lens and gave that one a chance) which at least provides images that are fine to me but it's mechanical quality is .. hmm .. lets say: a lot less than perfect but ok for that price. Sorry, missing the english words to tell exactly what's wrong with it. Tom PS Which lenses are in that kit? If you don't really need the 18mm wide-angle, than by all means think about paying money on the 18-55 EF-S which is in the european kit.