[quote name='bass_ferret' post='149489' date='Mar 1 2008, 03:42 PM']Why use a cheap knock off and keep the real thing as a back-up?[/quote]
The SM58 is my mic I used in the 80s, and the Behringers are band-owned. There isn't a lot of difference in the sound or performance although the behringers seem to have more output , so require slightly less gain on the PA input.