I'm just wondering because I was also interested in the e906 after using the e609 all the time. I really, really like that mic. I use it every weekend for live gigs and it works like a charm. One of the best purchases I've ever made.
the only diference i've found in the descriptions are
"3 adjustable sound characteristics (Bright, Normal, Smooth)"(e906)
and the e906 has a 2.2 mV/Pa sensitivity and the 609 1.5mV/Pa
but I really dont know what "mV/Pa" means =/
what is that anyway?