I've been asking the same question in the "snowplow and rear weight" thread. This is part of a response I got from a metal cutting edge user:
<font color="blue"> I have been plowing the drive for 20 years now with a 8 1/2' Fischer snow plow mounted on a 79 Ford 250 4wd.... I have used the blade for so long without the shoes, that I don't even know where they are now....I have neighbors that used the plastic blade edge and they wear them out every 2 or 3 years and they are expensive to replace. My cutting edge has been flipped once and is due for replacing now. $100 for a new 8 1/2' metal edge or $250 for a 6' plastic..... this is what I call a no brainer....
To finish up what the truck leaves behind, I do some clean up work with a old Bolens with a 54" blade with a metal edge. </font>
Another writes: <font color="blue"> As for the blade, mine came with the normal steel edge and the steel shoes, and that's what I've always used. </font>
I appreciate the above input, but hearing from urethane edge users would be good to help us newbies make up our minds.
OkieG