The reason why you don't see many people using this stuff is because they haven't had those tube fenders on their site for very long. I just saw them for the first time maybe 2 months ago? Plus they don't advertise, at least not on any forums I'm on, so nobody has actually put the word out that this stuff exists.
I might be going in that direction relatively soon. I already have JCR rear quarter armor, but that front fender plating looks pretty cool. I'd probably just get a local guy to bend me up a tube for the flare part since I'd want to go from rocker to bumper instead of welding the tube straight to the fender.