I bought this harmonica microphone to use as a vocal mike, aiming for an old school lo-fi kind of sound. It's half the price of the similar shure 520 DX, and it does the trick and. Although I haven't tried an 520 DX, I am satisfied with the results I get with this one. I haven't tried to play an harmonica to it either!
Positive - The price is very good, considering all the similar products available. Sturdy and well built. The mike has a built in volume knob so it's easy to dial the right volume you need without going to fiddle in the mixing board. This comes pretty handy when you are on stage.
Negative - The microphone should be prepared to be mounted on a microphone stand. Superlux has a version for mike standing (although I couldn't find it for sale anywhere) but that version dosen't come with the volume knob on the mike.