This proven mic has come down in price, while the one below it--the Sony DS70--has remained pretty much the same.  For the extra 15 bucks, the Sony MS907 is easily worth the upgrade.  The only advantage of the DS70 is not having to worry about having a fresh battery installed.  The MS907 sounds fuller and richer, but frankly I did not judge it to be superior to the overall effect of the 4-point microphone that comes with the popular Zoom H-2.  Whether or not you choose to use it in place of the onboard mic of a high-end personal audio recorder really comes down to a matter of personal taste.  On the other hand, if you've picked up the new Zoom H-4n, this Sony stereo mic would be an excellent choice for complementing the onboard ones since the new Zoom allows for use of onboard and external mics simultaneously.