Mediocre.
It took me a long time to find what I was looking for. If you aren’t familiar with the kind of “jargon” (for lack of a better word) involved with creating fonts, it is frustrating because you can really only search by what language is supported or by the type (ie, serif). It would be really nice if you could search by what the font is a good alternative for. For example, I was looking for something similar to Times New Roman. If I could search for fonts that had similar appearance or characteristics this would be a much better app.