I wouldn't put one on a really good bike or one I wanted to keep for a long time. I put a Performance Axis Pro 1" threadless, full carbon fork on a Zebra over 10 years ago, and just transferred it over to a very similar (but better condition) Nishiki frame this year. Converting to threadless isn't that hard, and will save more weight, if you don't mind the look. The carbon fork smoothed out the ride and tightened up the wheel base a bit. It's held up fine on 2 bikes, now, but all the stories and pictures of broken carbon make me cautious- even though I have a Nashbar carbon seatpost, too!