I am putting on Powerflexes soon. I too wonder what exactly is different between MTC and Powerflex. They seem to be designed very similarly using the same material.
Sapphire Black MetallicNatural BrownSilver Cube
e46 330i ZHP/6MT - Sold
M3 - RIP
Alpine WhiteTanSand High Gloss e46 330i SlickTop/5MT