I've been flying helicopters for 4 years now, and have 4 heli's, 2 T-Rex 450's, a Blade Cp and an mCx.  The smaller Blade Cp is easily the hardest to fly.  What I have learned in setup has come from the T-Rex.  The mCx is there just to be a fun indoor flier and has succeeded at that.  Here I have a little on my heli's and some setup tips that will hopefully help you.