I just switched to one a few weeks ago, and I personally believe that it was not worth it.
I got the whole clutch cable kit that comes with the adjustable cable, firewall adjuster, and double hook quadrant. I used the stock piece for 5 years with both the stock and a SPEC stage 2 clutch, and it worked just as well as the Steeda setup that I have now. I would say spend your money on somethin else unless you are having problems with you clutch cable.
Also, you really do not need all three pieces. If you get the quadrant, then get either the adjustable cable or the firewall adjuster. You do not need both. Having both is redundant. If you keep the stock cable then you only need the firewall adjuster with the quadrant.
I got the steeda double hook quadrant and firewall adjuster because I upgraded my clutch to a Centerforce dual friction. I like being able to adjust my clutch cable with the firewall peice.
I have also heard stories of people breaking there stock PLASTIC clutch quadrant because of the stronger clutch and faster shifts......