Depending on what you are tying to learn with this survey, you probably either want to state this survey is only for the people who have the option to run either firmware, or if they answer standard ASUS firmware ask the followup "Is merlin FW available for your router?" Otherwise your results will be skewed by those who answered stock firmware as that is the only option. In my case I've had multiple ASUS routers through the years, and use Merlin when I can. But on a couple of occaisions got a great deal on a used ASUS router that isn't supported by Merlin.