Not to sound like a broken record, but there is no amount of money saved on lesser quality gear worth the peace of mind knowing that your protection has worked for dozens of people on this forum. I high centerd in about a foot of water on my UC and rocker rails. The winch dragged my 3 the entire length of the rail and the only damage done was to my dignity (God bless them folks that put winches on the front of their jeeps.) You only have to need them once for them to pay for themselves. You will be glad you have them.
I think if you look closely you can see my 3 settle down on that damn rock. This is a link that H3 Hummer put up some time ago, back when I was still in Seattle.
http://www.driveyourhummer.com/rieterspitdec.05.htm