Originally Posted by cyccommute
Threadless can, and does, loosen occasionally. Often I have a problems with them within a few hours ride time of installation but the adjustment is simply to loosen the stem bolts (typically 2 5mm allens), tweek the top cap to take out the play and tighten the stem bolts back up. It usually takes more time to get the allen wrench out then to do the adjustment. Complete installation of a fork takes just about as long.
Oh, I'd agree it's quick, but how precise is it? With a traditional (threaded) headset you can adjust the stem up and down and side to side if the bars have turned and the steering head adjustment does not have to be disturbed.