Heh...I know how you feel man...I like painless too!
But from doing searches on a few websites,I have heard that they are not of the best quality as in longevity..As to the one wire hook-up...It's just MY assumption that it couldn't work..Since I have been trying to do my homework on this before I start buying,I have read that the wiring in our cars is barely adequate for the weak stock alternator..much less a 130 or 140 amp...there are weak areas that have to be adressed before you can boost up the power...
Usually the end result can be a major electrical problems even fire...a friend on another website just recently had a fire occur...fortunately,he got it under control before any serious damage occured..
I dunno man but,if you still want to take a shot at the Powermaster,go for it...if it works out for you,I just might be on the phone with Summit myself right behind you...
-Milt