Yes, I did the full front and rear conversion. I did the fronts several weeks ago as part of the Beta test. The rears were completed about a week ago.
The difference is more that noticable. My subjective opinion is that the front kit improved front braking about 15% to 20%. Completing the rears has helped some more, but mostly they seem even more "stable" or predictable.
The Fronts use Focus SVT rotors with the stock Contour SVT calipers (either E0 or the later ones).
The new rears are the old front rotors with the stock rear calipers.
Not only does it stop great, it also looks great.
It was well worth it.