" You should also use the product yourself, and you should use it extensively across multiple user types. If it’s a product with free and paying users, try to use it in both scenarios (if possible). Think about what parts you enjoyed and what you didn’t. Pay particularly close attention to anything that would have turned you away if you weren’t “forced” to check it out. "

― Gayle Laakmann McDowell , Cracking the PM Interview: How to Land a Product Manager Job in Technology