As soon as I get my Sigma kit, I'll compare to my Kryolan duofiber, my trainer's MAC187 and the CS one (there's a girl in my class who has it).
And as someone said above, I'm not interested if it's better than MAC, we have to think cost-benefit here.
Oh, and I forgot to mention in my previou post that the phone number registered is a US one. Some companies register their sites outside the US, so they can ship abroad and I honestly think it's very cool, 'cos I can't afford a MAC 187 here. It costs 4 times more than the price u guys pay for it.
And for those complaining they're lame for grabbing MAC's numbers, I think it's fair for a small company that only makes BRUSHES to have this approach. I'm sure they'll revise the concept in the future, if they wanna go further in the tools and accessories universe.
Just my 2 cents.