I use this as a Mic for my Guitar Amp (Fender Blues Jnr)
It provides a brilliant clean, clarity to the sound through the PA. It doesn't 'colour' the sound too much, and where it does, I like it.
I use it with the lead looped through the amp carrying handle and the mic up against the speaker grill. OK, this way only gives a limited amount of lateral movement, but I quickly found a nice sweet spot, marked it with some tape and away I'm going!
The Mic clip (which I'm not using obviously), isn't very substantial, and looks like it could easily break. Something to be aware and careful of if you're using it like that. The Mic itself weights about the same as a Bumble Bee, and this too might be a concern as it doesn't feel very substantial. I'm very careful when handling this Mic. That said, the design has stood the test of time, so what do I know?
Overall, just like the Shure SM58 or SM57, this has earned its reputation by simply doing its job, and doing it well. I like the fact that it simply hangs flat against the speaker, something that the Shure 57 could do at a push, but without the main area being available to pick up the best sound.
Give it a go.