roll your eyes all you want. Mine lasted from roughly 1998-2004 as an everyday street car for about a couple of years that did the odd Datsun club day at Lakeside, then a street/track car for a couple more year and eventually a dedicated race car for the last 2 years. In that time they survived a crash at Mt Cotton Hillclimb that tore a castor rod bracket off the chassis, and another crash in a classic road rally sideways into a kerb that sent the car airborne, broke a wheelbearing race and bent the chassis. They were pulled pretty hard to about 7 deg castor, ran grippy semi slicks, and had a big heavy L18 in the car. In that time it would have easily done over 50,000km and countless events. I wouldn't hesitate to do it again. It's a pretty common modification for race cars. The modification done properly causes no more stress risers than is present in the standard unmodified part.