I used to read the blogs and I've tried it myself. Most people fail, including myself. Of course I will try it again one day, now that my diet has improved. It may be a turn off to many that so many people fail it, but if you are determined, have mastered monophasic sleep, and have a great diet give it a try.
By the way, here is a map of polyphasic sleepers
Try Polyphasic - the Web's Polyphasic Sleep Community - The World's Polyphasers.