I've got a Zetec Turbo Fiesta with an AP 4 paddle clutch. From the beginning I had a very low biting point, and slow gearchanges, thought it didn't grind when putting it into gear. The ratchet finally gave up about three weeks ago, and tomororw I'll be finishing off the manual adjust conversion. I've had the old pedal and quadrant off, new pedal, quadrant and cable are now in, I just need to hook the cable onto the quadrant and the job'll be done. It's not SO bad, and should be very worthwhile.
It noticeably slowed me 0-60 times, as my gearshifts are all much slower than they should be on a brand new CTS 'box! Bite the bullet, do the pedal conversion