I guess I am lucky. I got nearly 1500 miles on my new throwout bearing before it started screeching. I do have proper free play. It has gone from occasional to every time I push the clutch pedal in and the noise level has increased greatly. Very embarrassing at stoplights. I put it neutral when rolling up to a light. People in the next lane often say nice truck or give a thumbs up until I put it in gear and they hear the screech.
Going to have to fix it soon but not ready to wrestle the 4 speed by myself. It was so easy to install on a bare frame. Searching regarding this problem indicates we are not alone.