An aftermarket clutch quadrant and firewall adjuster allows you to fine tune clutch pedal feel and engagement. This MM kit allows you to continue to use the stock cable which is actually better than the aftermarket cable. Additionally the stock quadrant is plastic and can become brittle or flimsy with age.
The differences between MM and Steeda is in the name mostly I guess. Both are CNC machined and are light-weight. The firewall adjuster is what will allow you to fine tune any clutch cable slack. I personally like MM over Steeda. Both are good products.