Yeah, I did the Escape Room at SXSW but you had to RSVP (which of course filled up in seconds) or try standby. I got in on standby after about a 30 minute wait. Really neat experience, but they better have 2 separate escape rooms if they want to get a decent number of people through.
I feel like it might be something else all together though. If not, why not just call it HBO: The Escape?
Also, yeah, since I do the GoT experience every year at SXSW, I only go to the SDCC version to see the cast/crew. Last year we got to meet and take photos with Liam Cunningham/Sir Davos, and the year before it was Maisie Williams and Sophie Turner.
But outside of that, it gets less and less worth your time as the week goes on and lines get longer.