It's first and foremost a vocal mic, but it is very good on acoustic guitars and alto! Careful: Don't use it upside down (the capsule could unscrew!)
The original tube does the job, it's neutral and clean.
But it really becomes amazing with a Telefunken 12ax7!
Rugged.

OVERALL OPINION

I've been using it for 4 years and prefer it over a Neuman U87. It is much more precise.
Very good value for money 10/10