Yeah, Dicta freewheels are terrible, and cheaper ACS are not too good either. I've heard people refer to ACS as "A Clunking Sound" because their lower-end freewheels are noisy and crappy. I used an ACS Claws and it sucked. Cheaper freewheels don't have good seals so water and dirt get into them and make the pawls rust and stick or not engage fully because of interfering dirt and grime (esp. a problem on SS mtb). White Industries freewheels reputedly have the best seals and longest service life but are very pricey. I personally like Shimano freewheels for good compromise between quality and price.