Eleventyseven = Relient K
11T7
I agree with Dan's comments regarding Relient K. And I also agree that 11T7 does not sound much like Relient K at all, especially their recent music. They have really expanded their sound.
In my opinion, most or all of the other new pop-punk bands that I have heard in the last 2 years sound either all the same, or like Relient K attempted copy cats. When I am listening to RadioU, sometimes I don't even know which band is playing. (Not including Relient K here. I am only speaking of new bands.)
Now, if we were to expand the options to mainstream, then, well, I would have to agree that 11T7 sounds like alot of other bands out there.
But I saw MxPx the other day and I was thinking, "You know what? All bands of this genre sound the same in the end."

Eleventyseven != Relient K