I know. Not much except that I have to move there and risk their business don't drop 50%. The other risk I am taking is I am leaving a comparable company in Canada, but a intermediate position.
Based on that, I would say that it is worth it. If they are offering you a job right now, it's not likely that they are considering cutting it any time soon. SV is a great place to be if you want to branch out (I'll assume you do as an HN member), and moving up to senior cannot hurt either.