I bought this Copperback slightly used, from someone who bought it new and then, I expect, didn't like it.  I've used it lightly too, in a 2x12 with an EVM 12L which I am also selling here.  

It's really good:  I like the quick attack of Neo speakers, and I have another Copperback and also a Wheelhouse 200 from Eminence.  As to the EVM comparison:  Copperback is as loud as a 12L, and I think comparable really well aside from "mojo" and low end, but I've only played the two at limited volumes since my rig lives in a basement.  Here's a take on the two:

For those who are curious, "Copperback vs EVM 12L": someone on a forum has said that the Copper is the "feminine" equivalent of the EVM and I think that's about right. It has a softer but brighter sound and is every bit as loud (see volume note above; I've only been able to play these so loud). The Copperback handles all volumes well, bedroom to basement-shaking; you don't have to crank volume into it to make it sound good. It's very bright and can "beam" you if you have your treble and/or boost up high, but since I run a pedal rig into a Powerstage now, I have a lot of cable length and am always trying to maintain high end with buffers and treble knobs turned up on everything, so I find Copperback an excellent solution.