I don't know if you know John Mercedes personally but I would never buy anything he puts his name on or is even associated with.
I remember that kit being a little over $3,200 for a group buy price back in 2007. That was $1200 off of retail value, and that was with the most basic rotors you could find. A little pricey, when I did my fronts, 14" rotor and 4 piston brembos for just under $1,000. My bracket however is not marketable but I am playing around on solidworks right now.