http://kbergend.tripod.com/milabs03.jpg
^^^^
On a dorky technical note I'll mention that due to the unusual rectangular shape of the capsule, the ideal orientation for the mid mic would be vertical. The directional patterns of this mic should be more uniform as the frequency rises in the plane perpendicular to the mic body, with a sharper null, and sources located above and below the vertically oriented mic should be attenuated a bit more than would be the case with a typical round diaphragm fig-8. Another way to think about it is that directionally, this mic should behave like a small diaphragm mic in the horizontal plane and like a very large diaphragm mic in the vertical plane (with the mic oriented vertically).
It's similar in concept to the very wide wide but truncated top and bottom dispersion of a line-array speaker or a tweeter shaped like this-
That's a feature, not a bug and could be used to your advantage.
Never having used or heard these myself, I have no idea how much of a difference orientation of the mic really makes. I might not make much difference at all. Just sayin'
I'll be recording some bluegrass next weekend, planning to try them out
BLUMLEIN!!!!!
I'd love to hear the BLUMLEIN!!!!! samples. These mics are really intriguing.