I have the Protos Mini and let me tell ya it's just awesome. Of course I started on the EXI so that would not be a fair for me to rate the against one another. The Protos products are solid, really solid. I have somewhat decent servos, a high end esc and a cheap tx fitted with frsky module and rx. My heli is so stable and smooth in sky and the control is spot on even with a flybar (which is how mine is setup). Check out the pics I just posted in the
Picture area. Since I have the 450 and know how it flies, I cant imagine just how well the 500 flies. Plus I have seen it rumored the a 700 is scheduled for release soon. The color scheme on the 700 is Purple black and white.