He will answer your email in a thoughtful manner, despite having no idea who you are and that it's 99% likely that the only reason you're contacting him is that

He will answer your email in a thoughtful manner, despite having no idea who you are and that it's 99% likely that the only reason you're contacting him is that you want to promote your widget. That kind of infectious engagement is incredibly hard to come by - they guy just lives it.