I like em. They're definitely stiffer than Ps or my C-rated BFGs, but not a lot stiffer than the Cs. They certainly don't feel like a dump truck or '70s F-250, as I've seen some people say of E rated tires.
My drive yesterday was about 2 hours each way, mostly highway with some interstate doing 55-75 mph and over half of it is old hwy 82 which is not groomed anywhere near as well as an interstate typically is. In other words it's full of potholes, cracks, and generally worn out asphalt.
I did notice the stiffness but not nearly enough to make me regret my decision. The only time the stiffness bothered me was in spots where there were a bunch of consecutive potholes and cracks within a few inches of one another, but no tire is gonna soak that up well. On the interstate sections I didn't notice them at all.
Now I am used to a full size truck with D & E rated tires, so you may wanna take my input with a grain of salt.
I still need to get some chalk and do a chalk test, but hopefully by this weekend I can do that.
edit- I am seeing about a 1 mpg drop vs. the same size Dueler ATs, but didn't feel the noticeable power loss I felt with the 275/70 GY silent armors. Actually my GF drove a bit and was surprised by how much power the V6 has (she's never really gotten into the throttle before passing a semi in the truck lane yesterday).