Hey fellas, So I am running a Mesa Buster head into an older mesa powerhouse 115. I really am digging the tone for sure. While surfing posts I always see guys say they prefer 15s in pairs, so of course I think, "well I gotta get another 15!" I don't really need the volume as I run the gain at 2 o'clock and the master at 9 o'clock or 1 o'clock if I want my ears to ring after the gig and every one in the band to give me the stink eye. So my question is there any advantage to getting another matching 15 besides volume...and friggin looking cool of course.