I've got a live gig to record featuring a few solo acoustic singers, and I would love to throw up a Royer 122 but I'm wondering if that rear lobe is going to cause headaches with feedback and such since vocals will be coming out of the PA.
I think the PA is their only monitoring too, last time I was there I didn't see any wedges. It's a smallish place that doesn't like to crank it up too btw
I wouldn't be too concerned about feedback. Ribbons are very directional and the rear pickup is in opposite polarity to the input signal. (Edit: you may still get feedback from direct rear pickup but the off axis rejection or ribbons makes that unlikely)