On the right material the Bluebird can sound very nice, but a couple of things to watch out for:
First, it can be a bit "forward" to the point of harshness in the upper mids. Since you mention you want it for female vocals, this could be an issue depending on the voice in question.
Second, although billed as a cardioid, the pattern comes a bit closer to hypercardioid. This means the singer has to be very careful to be directly in front of the diaphragm and also that directly behind the mic there's a little spot where there's a bit of pickup (the null is good to the sides though...hence my hypercardioid description). Anyhow, this could be an issue in an untreated room--you could probably get a good recording with careful placement and aiming but it'll cut your options.
They look damn sexy though!
(Above was gleaned from a couple of days playing with a friend's mic...I don't actually own one.)
Suggested alternative to consider: the sE2200a II C. I have several 2200a variants which are my go to mic for many vocals, particularly female. I tend to use them in preference to several rather more expensive mics I have.
There goes Bob again. Falling in love with still yet another microphone.
