Being a 2010 or not wouldn't have an effect on it since it's the same drivetrain. There are way too many guys who don't have problems to say it doesn't work. Go check out S197Forum and ask around, lots of racers there.
I even ran a Roush P51 clutch disc in my car with the OEM slave cylinder and I didn't have problems with it until the clutch disc warped. McLeod RSTs are rated at 800hp, powershifting at 6,500-6,800 RPMs with no issues with the OEM slave cylinder. Same with the Roush P51, too (Puck Style Mfg by
Exedy). The article by MM&FF is promoting an advertisers product, of course they are going to say buy it!
Powershifting a 2005+ Mustang is problematic with the OEM clutch. It's problematic with an aftermarket clutch, etc etc. The issue is in the remote mounted shifter design. The issue is the fact that the motor and transmission is twisting with torque but the shifter is mounted quite solidly to the body via the rear mounting studs. Adding a CHE K Member Brace with Torque Limiters will fix most problems with powershifting or speed shifting at high RPMs. Syncros could cause a problem with shifting as well.. Also a slave cylinder doesn't go bad unless it's leaking which allows air into the system.
View the V8 K-Member Brace with Engine Torque Limiters<br>Part # CHE7LA at http://www.cheperformance.com