I have two of these in a zilla closed back 2x12, plugged into my Selmer Treble n Bass/Laney AOR. I mostly play downtuned sludge, skramz, post-rock and noise.
Very clear sound across the guitar spectrum, sounding great with both cleans and distortion, to my mind a much more open sound than the standard v30 you find in most cabs on the market, works perfectly for rhythm work or as the sole guitarist in a band situation.
There is a thick, thumping bass sound to this speaker which is great for extended range or downtuned guitars, or just adding a bit of meat to your sound. However it's possible that this could get on the boomy side in a an open back cab.
While this speaker is aimed more at 7-string, modern high gain players I've found it to be perfect for cleans and a grittier, preamp/poweramp distortion sound.
Highly recommended to anyone looking for an alternative to the industry standard v30 sound.