I likewise had the earlier version of this (ECM907) used with a portable MiniDisc. (It would also be useful with current portables such as the H2 or MicroTrack.) It is probably not your average taper's mic as it is a bit light on the bottom end, and the noise level is a bit high but it is good for stereo interview and actuality uses where something compact is required, remote from the recorder. The other thing to note is, as I was often using the result on mono AM radio, the mono compatibility was very good.
Its use declined when I bought a pro MD portable (HHB PortaDisc) and bought an AT825 to go with it. Sold the 907 to a fellow radio colleague and is still in use today.
The ECM909 looks like a new embodiment of the same design - maybe the noise has improved slightly. For better frequency response and lower noise but a larger size and higher cost, maybe consider the AT2022 or AT8022
options. But it's a horses-for-courses decision.