I bought a mic from Matt and have been having a crack at recording with a cab I recently bought. My very first try ended up really boxy, like Freak Kitchen boxy. This is like my third try. It's still very boxy, but not quite as much as the first one.
If I learned anything from getting a mic and cab recently, it's that micing a cab for the first time is a lot harder than people make it out to be.