My company runs creative tests all day every day.
We've seen the best and worst of it, people throwing money at non-marketing problems, people making 130x ROAS for more than a week on a single ad, people going from .25 to 1.5 and more.
Creative testing is the most fun part of advertising in my mind. You get to come up with a hundred big ideas and test them all.
I'm open to sharing creative data.
What's your experience been with ad testing?