Dave, I think just about anything, so far. I have tried it on electric and acoustic guitar, vocals, overhead (in pretty close). I am also finding it really works well with the Daking MicPreEQ equalizer points.
I would typically be choosy about mics, and not lean on EQ as much to get tones, but there are times when you just want the timbre of the ribbon... and if you really know the general frequency content you want for a part, you just want to shoot for it and get the tone while tracking. The broad A Range type eq curves of the Daking are pretty hard to get in trouble with, when coupled with this mic.
That said, if you are using it for multiple overdubs, no processing at all, it stacks very well. I don't want to paint a picture that you have to use a ton of eq it to make it work. One may end up using *less* than average with a ribbon. There is a certain natural taming of the low mids that winds up being similar to how I might wind up eq-ing various classic model ribbons. I had heard that said about this mic before, and find it to be true as well.