I’m fond of saying that as a product manager, you need to know your user and remember that you are not your user.
Always remember who you are designing for.
Yet, I have to agree wholeheartedly with Biz Stone when asked by a Jelly user why he’s spending his time answering questions on Jelly. He said “…if I’m not using my own thing, I’m working on the wrong thing.” A passion for your product is important, and it will drive you to make it better every day. Using your product is just as important, crucial even, so that as the product’s owner you experience how it works and see how people use it.
Well said, Biz.