I'm very pleased with the way this dado set is working out.  I was concerned with using an 8" stack with a 1-1/2 hp delta contractors saw, but so far it's working out great--even with all the blades installed.  I don't have any experience with other dado stacks, but to my eye the cuts from the SD508 are superb.  Clean, flat bottoms and sides.  No chip out at all.  The only thing that is a hassle (not unique to Freud) is that it IS a dado stack.  Putting the both cutters and the chippers together for a cut can be a chore.  Now I know why Bill Hylton says avoids using a dado stack in favor of using a router to make dados in some of his books.  :-)