Damn, at that price, you'd need to save A LOT on gas to pay for the difference!
I DO love that they are lighter though, weight is the enemy on the trail as it sabotages your COG and makes every obstacle harder, etc....so performance-wise, I think they're a good idea.
If you cut even 100 lb off the rig's weight, its noticeable in performance, and these should be great in that regard.
1/4" AL can be pretty strong, and at least it will be easier to pound flat again as opposed to the PITA *** it was to try to get my old skid-row plates flat again.