neo magnets are much much stronger, they also cost a hell of alot more, the advantages are better cooling , and stronger magnets , the cons are cost , design "cuz they dont make very large neos.. go take a look at magnet prices alone... ceramics like on most woofers can be cheap as hell , 10-40$ per magnet , but a neo on the other hand is like 60-250$ for a neo magnet, i have another type of magnet im going to be building a subwoofer with, i dont wanna give to much info away ... i dont want everyone else trying it and saying they came up with the idea. i have dated pics n shit but im not releasing any of it to the public at this time.