I just installed a 1" BL and the front bumper looks fine - rear bumper there's a SLIGHT gap but it's nothing crazy. You only notice it if you're looking for imperfections back there. I assume it'll be slightly more apparent with a 1.5" BL :tape2:
I didn't take mine off. There is no doubt that a 1.5" body lift definitely pits some stress on the front and rear bumper covers. I wish you the best of luck getting it back on.