Just downloaded it to take it for a spin. First off, it doesn't support Olympus raw files, but, fortunately, I had some DNG lying around, which did work. However, it expects to pick from a list of raw formats. All seem to work, but it's not immediately clear what the difference is.

The settings are a bit daunting at first; some are what you expect in a regular photo editor, and others are... weird for me. Like, what's "lift" and where are my white and black sliders?

Color tools seem to be interesting, but there seem to be multiple places where you select color spaces, and all defaults seem to be video-centric (which I guess isn't unexpected, but it just means you have to know to go hunt for them). There's also a dedicated "color" page, which I think is what all the fuss is about, but if I switch to it, my photo disappears and I'm presented with a video timeline...

I also haven't found any trace of masking, and noise reduction seems to be a paid feature, so in my case the free version wouldn't do...

All in all, I want to like it, especially since it runs on Linux, and will probably continue to check it out from time to time, even though I'd have to convert the raws to dngs beforehand.