I'd been hearing about the differences between Sennheiser's e609 and e906. I eventually got curious enough to pick up an e906 to compare it to my e609 that I quite like. Found one on ebay for 96 bucks "new", thought it was a good deal, and ordered it.
It arrived and I decided to try it out. I recorded my amp with the e609, then did the same with all three settings on the "e906", making sure place the mic in the exact same position and angle. The results speak for themselves.