I'm familiar with King and dt240, vs a nice hub like Dura Ace, Ultegra or Record they're noisier when coasting but have much quicker engagement which matters more in cross and mtb rather than road. Despite the excess noise I've found them to coast better, the design is supposed to be less friction than a pawl system and I tend to believe that, vs a higher pawl system like white industries I find the kings and DTs to be both faster and quieter. Personally I like Kings first, a DA or XTR hub next and White Industry. Not certain how the I9 hubs compare to the White Industries but the ones I've seen being ridden were all the loudest hub I've ever heard though owners have claimed them to be as quick an engagement as a star ratchet system and just as smooth.