I have Realflex Scream 2.0. The first time I wore it, the stitches/ micro-fibre at 1st lace holes cut my feet just behind the toes, I adjusted the laces and with the help of thicker socks, I completed the break-in. By now, the insole is very comfortable. However, only 1 issue: he footbed still tend to slip with thin (cotton) socks - my typical experiences with Reebok running shoes footbeds. If I further tighten the laces, the slip is gone but the insole might make my feet not too comfortable. Other than this, the Realflex is the most flexible and cushioned running shoes I ever have. My feet and knee pains after running training are gone.
Stability / Balance seems may be improved further.
The Scream 2 meets my expectation for RealFlex. Light and very flex. However, the shape of the bottom is like a canoe - tends to roll left and right when I placed my feet on the ground on running. I guess if the cubes at the left and right edges are a little taller, it will not roll. I tried the drop test about 20" and let it fall, the shoe rolled left AND right for 2 - 3 seconds before it came to rest.