They look pretty good, and the prices seem decent enough if they are quality stuff. I'd do a lot of research on 4x4 sites and see what their customer service is like before buying though.
If you live close enough you can drive and pick it up, it'd be a great deal to save on shipping costs, though you'd pay a lot in tax instead.
It's also pretty rare for there to be an aftermarket company making such bumpers for the first gens, so it'd probably be worth it just to have. If things look good and you have the dough, you might want to grab one before they change their mind or discontinue making them.
We also have a site vendor who makes similar plate bumpers on the custom level:
http://www.explorerforum.com/forums/showthread.php?t=273287