I've got duralast rotors in the rear of my VX. Had em on maybe 35k miles.. theyre not bad, but im noticing hot spots on them, so more than likely will need to be replaced soonish.

as for cutting rotors, ive never been a big fan of it. if its not done exactly right, youll end up with problems. talk to the mechanic, ask him to measure the rotor thickness and compare it to isuzu recommended thickness. if you you are still above isuzu spec after cutting and there are no discolored spots on the rotors after a drive, id say youre probably safe

i would assume that with a groove on rotors youve had for 75k miles.. they wont be good to cut