For the money, you can't beat this vocal mic.  I've been using my trusty SM58 for about 25 years with no issues or complaints.  Recently I noticed that a couple of the guys in band had mic's that gave them a bit more power and top end, even with the all the levels on the mixing board set the same.  After doing some research, I decided to try the SM58 BETA.  Glad I did.  Another great Shure mic!  It's somewhat similar to the SM58, but the BETA has a broader frequency, more top end, and more output.  Now I've got 2 quality vocal mics to choose from.  Highly recommend the Shure BETA 58A.