Ok, what REALLY is the difference. Is Hamby's THAT much better? I know it has to be installed by an autorized dealer and I believe it's around $500? I talked to my tech and he says the biggest issue is getting them on right and keeping them there until they hold. I was going to order a Keel Guard from BPS and think that I am a relatively intelligent adult that is capable of mounting this thing myself. Shut up Mac and Mini! LOL So those of you who have them, am I right on the price and does anyone have the Keel Guard or Keel Shield. How is it holding up. How hard was it to install?