..worth it?

I've been toying with the idea of a speaker swap for my VK for a few weeks. I'm pretty happy with my tone but there's always room for improvement and someone on the local CL is selling 4 Greenbacks for $300.

Would Greenbacks be a worthwhile upgrade from the VK speakers for someone playing punkish music? (song on my band mysapce to hear style if you want, don't judge the tone I know it's incredibly thin and tinny. free recording though so /shrug)

As always, thanks in advance for any advice.
And maybe we can fly away from here, surf on the debris of a broken scene...