While it's a lounge for GM employees, during the dozens of times I've been there, I get the sense that they're not that strict. It appeared that if you could show a professional relationship with GM, and are a good schmoozer, they'd buzz you up. It also depends on who the gatekeeper is, but I'd give it a shot if it's something you really want to do. IMO, while it's interesting to see just out of curiosity, there's not that much to see or do up there, it's used much more as a conference, training and events venue. If it's being used for any of those reasons, visitors to the lounge will not be allowed into the main conference/event room in order to view EPCOT.