The only way to test is to get fit by a reputable fitter and then try it on the golf course. Also be careful with launch monitors because I have seen radar based systems come up with really high spin numbers compared to camera based units. Outdoors with your eye is still a great test.
Speaking of 'testing' . . .
I asked Larry Nelson one time how a good player could know if he was ready for the PGA TOUR:
"First," said he, "can you beat everybody in your state?"
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