Looks like it's on sale on Amazon. $128 for a $164 arm isn't too shabby. I'm not sure if this is always Amazon's price but i'm considering getting one. http://www.amazon.com/Muddy-Outdoors-Pro-Camera-Arm/dp/B00IJPEHBQ
Biggest difference I can see is the Pro is 4 inches longer once extended. Also, the leveling system is more compact on the Pro arm and not as bulky.
From talking to Muddy ab this arm its more sturdy than the outfitter, even though they are rated for the same weight
This arm is about as good as it gets for this price. The only trouble I have with it is hauling it in and out. I'm still trying to find the perfect bag to carry all my camera gear along and I think I just found that bag!