Totally depends on the health of my back. I first hurt it as a teenager playing soccer and then just a few days later tried a leg press and used bad form and made the injury much worse. I'm 26 now and the old injury is just gradually getting worse with the years.
Never do 1RM's anymore on squat. Good back, about 230 for 12. Bad back, I go super slow bar speed with 135 for about 15.