Though I've only talked to Justin a few times, he is one of my favorite people to get advice from. Between his five startups and entire adult life spent building them, he has not only seen most problems founders face, he has actually experienced them multiple times. This means not only do you get excellent advice, but also that he has a lot of compassion and empathy for founders because he knows exactly what it feels like to go through them.

Here is a follow up email I sent to Justin after discussing a problem we were struggling with at the time (his advice was great as always, even better was how optimistic we felt after speaking with him - that IMO comes from him being in the same place as you in the past and being able to relate to what you might be going through).

Justin I know you're a busy guy and have no time for fluff emails, but I'm gonna go out on a limb and tell you how awesome your advice was and how great we feel after office hours with you today. As you know, startups run on morale and I wanted to thank you for topping off our tank.