Just be aware that Barry Grant, who made the Demon carbs, is out of business and has no intention of returning, so getting parts and service could be a problem.
Ya beat me too it lol.... Depending on where you look you can see allot of bad and good about those carbs, everything from FOD (Foreign Object Damage, or Debri depending on what company you are at) coming from things like shavings left from the manufacturing process still in the carb ports plugging up squirters, to bad castings. But on the other hand there are allot of people that swear by those carbs and take them to the track every weekend.