As someone with a vertical 2x12, my understanding is that this improves dispersion in the horizontal plane, and is actually worse in the vertical. Am I right @Bill Fitzmaurice?
I'm happy to have a bit more headroom and the amp not working as close to its limit. Plus if I need to fall back on my Elf, it's only 130W into 8R, but 200 into 4R, which combined with an efficient cab takes it into the 'practical option for any gig' territory.