All in all this mic has proved exceptional.
I use mostly on my trumpet but have recorded many instruments too now include grand pianos, guitars (acoustic and amp) , organs and percussion amongst others. I am writing this review nearly a year after purchase and I have only ever been amazed by its quality.
I would add, it is definitely worth having a good pre amp for this, but when in place it is really lovely... I use mostly for recording but have taken out for live gigs (the sound guys at Ronnie Scott's were keen for me to leave it behind...)
I would add it is expensive, I was lucky to have some money together at point of purchase, but I really believe in aiming for highest possible sound quality where possible.
I would add, I have recently been in studios using £5000 microphones made by AEA ribbons (replicas of vintage) and they were honestly incredible too... And for me did possibly exceed the quality of the 121...
Ultimately though the quality is excellent and I would be happy with the quality of my trumpet just using this always.