I used to really be scared of feedback so my main microphone was always a dynamic one.
I finally decided to switch to a microphone that would provide me the quality of great sound and perfect dynamics, and I must say that Beta 87a is definitelly a great microphone, being that I am in a heavier band, I really got surprised how much gain this mike can take, and how tight it's pattern is, there is not much bleed of other instruments into this mike, and compared to the SM58 and the Beta58, this microphone (the beta 87a) to my ear feels like it can take even a tad more gain before feedback, or at least about the same as Beta 58, and it's really a lot clearer than the SM58 and the Beta58. The quality of the sound is uncomparable, there is no contest, this is almost a ''studio sound'' mike in a live performance!! :D
I've had absolutelly no problems in live applications and was definitelly able to turn it up to hear myself really, really well on the wedges. Though if you're going to use a lot of sound processing on this mike, I'd still suggest taking the InEar Monitoring route, as that's still only OM7 area of expertise.
I'm really happy with my microphone, knowing that I have one really high quality sounding mike in my collection, and I can't be happier with Thomanns customer service, these guys rock, will be back, again and again.