This is a condenser microphone.

Frequency curve is super straight, except for a bump to 12kHz.

http://wpc.660d.edgecastcdn.net/80660D/downloads/m3_datasheet.pdf

OVERALL OPINION

I find it pretty good on my voice compared to other microphones (Rode NT2000, Behringer B2-PRO).
I bought a pair: I take my voice in stereo, and it's pretty good.

I've also used as drum overheads (he is work).

To test a voice, for the price it's worth it.
The most expensive microphones do not necessarily give the best results (especially on a voice can be surprises).