I have not because I never used them, PSC talked me out of it. I raced along side of the owner and workers there. I have seen them blow out when under pressure, like turning against a rock or hard object. It may be the type of line or the user but when PSC and other racers said not to, I went the other route. Look at most high end builds, you will not see them much. The crimp fittings are about $13-$18 each, plus the hose, usually free to crimp when you buy all together at a shop. I buy all the parts, take them home, cut hose to length with a cut off wheel, mark with sharpie location and angle of fittings and take back and they crimp while I wait. Never had one fail.