Up to an 1" in depth I am aesthetically comfortable with a recoil pad. Over that I wouldn't bother - better off spending the money on having a really nice slip on leather pad, which doesn't look awful, can be readily removed for other shooters and can be minutely adjusted by placing cut pieces of car or foam inside.

IMHO a recoil pad or any extension over an 1" looks just wrong - unless a perfect job is done as per Doug Mann's perfect stock!!!!