Packs a punch
This thing is awesome. I bought one off a friend a while back and used it as my go-to mic for my small home studio setup. I used this thing on everything from guitar and vocals to a room mic for a drum kit. When you find the sweet spot with this mic it really sounds amazing. I placed this baby about 15' in front of a drum kit, right where the punch really smacked me in the face. I ended up carving out the low end on the Kick mic to leave room for the lows that I picked up with the Bluebird. What a bombastic sound!
Unfortunately someone jacked my microphones and when I rebuilt my arsenal I opted for the higher-priced (and well renowned) Baby Bottle. I don't regret the purchase, but I definitely miss having the Bluebird. It's a much more versatile mic than the BB and for the price you really can't beat the quality. Fairly flat response, and definitely more "transparent" than the Baby Bottle. Less coloration and a more natural and crisp delivery of the sound source.
It get's a 5 for features because, obviously, you're buying a strictly cardioid microphone with no bells and whistles (no HPF or built in Pad)