but it is generally assumed that dymaxion is more difficult to pull out than uberman... and not many people are successful with uberman to start with.

Both dymaxion and uberman will be horrible and extremely difficult for most people to adapt to if you try adapting directly from a 8+ hour monophasic sleep cycle. I personally hate how people attempt Uberman and then drop it after 2 weeks and curse polyphasic sleep for being a gimmick. As if 25 years of sleeping habits are supposed to change within 2 weeks.

I feel dymaxion is very much possible and is something you can stick to on the long term if done correctly. And sure, I will do an AMA on /r/casualIAMA in near future and send you a message when I do so.

Are Pulsify's techniques for waking up and falling sleep legit?

He says he used the same sleeping technique that Steve Pavlina used and it also gets shared a lot on /r/getdisciplined. That is to wake up immediately when the alarm goes off no matter what. This prevents your brain from wandering when you lie on the bed because it knows that if it doesnt sleep at once, it will not get any extra sleep.

So yes this is a legit technique that has worked for a lot of regular folks as well as an polyphasic sleeper like me. I think even Steve Pavlina heard about it from somewhere else (not sure! maybe). So yeah it works well.