Not to revive a dead thread, but the guy we bought our plane from (owner @ Seaplane Services) directed me toward this video:http://www.powerflowsystems.com/news.php?nid=90
"The Force" is my plane. Incidentally, I did my training in the 180hp 172 that also participates in the race. Fun stuff to see, although I wish it were me drag-racing!
It does show an interesting comparison between powerflow and non-powerflow equipped planes. Hard to be all that scientific in nature, though, seeing as the planes are all different in float setup, etc... No real good control...
On top of all that, we do have a STOL kit in The Force, now. Also just did the auto gas STC and added a JPI FS-450. Hooray!