If it's just a confidence boost... then I'm right and it's unnecessary. I maintain unless you're testing a specific thing, a check flight is a waste of time. You're changing the CG/CP, so it's not a stability check. You're not pushing it as hard, so it's not a stress test. If you're gaining experience doing X or Y, it's not a test of the bird, it's a test of you. Checkflights are dumb...and no one has yet provided a reason to do one that pertains to the actual rocket.