They do use Q-Bots, I've been to various Six Flags and I have to say they are totally worth it!. The most expensive one is $120, this equates to around £75 if I'm correct. Which is only £5 more then THORPE's ultimate fast track wristband. Six flags have limited amounts of Q-Bots on hire each day, there is only one area on park you can rent Q-Bots from. I went to Six Flags Great Adventure last year and bought the $120 Q-Bot, this allowed me to miss out the 1hr+ queues, I didn't have to wait anything! there wasn't any queueing in the Q-Bot queue, and you are allowed to stay on the ride twice!!. It's an amazing system. And their park hours are amazing, the day I went it was 10am-10pm, I left around 7pm, It's worth it at places like that.
They manage their Q-Bots well, THORPE should take a leaf out of Six Flags room