Almost No Feedback
I was using a Beyerdynamic M201 to reduce feedback when playing in a jam room. Feedback was lower, but not great. I really had to push my voice to sing over the drums and level matched guitar, and my throat was toast by the end of the jam time.
Then I bought a feedback reduction box. It helped a little, but I started to wonder if there was a mic built to reduce feedback. After searching online for feedback resistant mics, I found the electrovoice N/D967 get a lot of positive mentions. However, it wasn't available, and the ND96 had very few reviews. I couldn't find a single Youtube video showing it resist feedback.
I decided to take a chance on the ND96, based on a really good experience with the RE16 (also by EV). When I got the ND96, I brought it with me to the jam space. They bumped us up to the medium room from the usual small room, so the following comparison isn't exact (smaller rooms get faster echos, causing more feedback).
After we got to the space, I first plugged in my guitar. My drummer was still replace the cymbals with her own ones, when I was putting up the mic. I left the gain low, reduced the highs and lows, and bumped up the mids. I angled the mic at 120 degrees to the speakers based off of the polar pattern. I didn't even get a little feedback so I turned the master volume up, but left the gain low.
I had no feedback for the next several hours. My mic volume could have been a bit higher, but I also could have turned the guitar down slightly. Even so, I could hear myself and did not have to push my voice to the point of going hoarse at all.
Towards the end of the session, I tried tweaking the volumes a bit. I cranked the gain, and lo and behold, got some feedback, but not much. After lowering the gain to normal levels the feedback was nonexistent. I also tried cupping the mic (which you don't want to do anyway) to see what would happen and of course got feedback again.
I never got a chance to try my feedback reduction box. I found I just didn't need it. I will bring it next time so I can experiment in the small space we usually book. However, if I find I don't need the box there either, then I will save myself from having to remember it.
It you've read thus far, then I highly suggest this mic for feedback prone rooms like jam spaces. It was either this mic or the $700 Neumann KMS 105. That one sounded great, but required phantom power, had more problems with Ps and Bs, and wasn't necessarily any better at handling feedback.
I have not tried the previous version of the same mic, but I can tell you this one is great. You may not be able to point the mic directly at the speaker or turn the gain all the way up, but if you can get lower feedback from another mic, I would be surprised.