A great resource (besides our inestimable Tekker) for questions about mics and such is the usenet news group rec.audio.pro which can be googled from, er, google
. generally the posts are of high calibre and most of the regulars are proven professionals in recording.
From google, select groups under "more" then do an advanced search with e609 in the "all the words" and "rec.audio.pro" in the group name. And you'll get... 240 threads that discuss the pros and cons of the senheiser e609.