Summary: I have used the SM58 for live performance for literally 20+ years! It has never failed to perform exactly how it is expected to. I've dropped mine on a cement floor (during tear down) and it did dent the screen a little, but still works great.
Excerpt: We use the SLX system at all of our mobile DJ events. We now have 2 systems that are exactly alike. The initial system has been used for almost 10 years now with no issues whatsoever. We just picked up the second handheld system and a separate bodypack/headset unit.