Interesting activities but user-unfriendly location.
I haven't yet gone to the Concourse Exhibitation Center ... All those super-wide streets with aggressive drivers in fast-moving traffic in an environment of concrete & steel are a real turn-off to ever going over there. Distance-wise, I could walk there from Caltrain, but I don't think I'd want to. Driving around there is probably as bad or worse. Can't imagine where/how you'd park.
This is a cool place. I have only seen half of it though. Its a long narrow building, I guess sited for the homeshow type than a concert. It has a lower center isle with two high isles on either side and a Balcony above part of the center isle. The Bathrooms are nice too.