My most used live mic. Great both on it's own, or when paired with a beta52 or similar kick out mic, and less harsh and more natural sounding than an e901, in my opinion. I use it nearly every show where I provide mics, is definitely one of my better investments, and if I could only take one of my live mics out on a gig with me, it would be this!
The new 91A variant improves on an old design by having a full sized xlr connector and no longer requires an external preamp module like its predecessors. A massive win as it's now absolutely bomb proof and you're not scared to take it out your mic box in case the cable breaks again!!
Also the frequency curve switch kind of lets you choose between a beta91 sound and a flatter sm91 sound, kind of... It is similar, but not quite the same the same as the classic sm91!
If you're looking at this mic then you probably know what it's all about. So just buy one and thank me later! :)