Well, I really wanted to like it. All the reviews told me "it's free & there are soooo many cool options".
First of all, its incredibly aggressive about getting a subscription. There are popups, there is a button displayed on the main screen (yes, you will CONSTANTLY be reminded to subscribe) and if you want to use the glyph-feature (you should be able to copy any glyph from there)... well you see 2 lines (!) of glyphs, the rest is hidden behind a subscription message. I would not mind, if I just can't copy all of them, but at least let me SEE all glyphs.
The UI is not good, but not bad either. Just normal, nothing out of the ordinary. A list of fonts and you can adapt the size. But that's it. That's all there is for me.
I understand there went much work into it and I would not mind, if they were honest about their feature set and not trying to lure you into subscribing. But if you are looking for a free font manager, there are better options out there...