Just wanted to toss up my latest video, so you can see the change in porthole effect from lens to lens.
Up first is the stock GoPro lens (fisheye):
http://vimeo.com/23322626
Next is the Mako:
http://vimeo.com/26354092
And finally the Pursuit:
http://vimeo.com/29128053
The first two were edited with QT Pro, and the last was with Nero Vision. I MUCH prefer the Nero product. Many more effects and video processing options.