I recently got this in a bundle offer, but glad I didn't pay full price, I agree with others that it's a bit expensive for what it is.
I tried importing my Aperture library, but I ended up with all the folders and subfolders in a flat list, with no images in any of them.
I have tried a few imported images, but see nothing really extra special about this app. I already own Lightroom anyway, so see nothing compelling here too make me think of a change. It might be a reasonable solution for someone starting afresh with a photo manager/editor though.
However, at the costs I'm seeing for some of these alternative upstart image managers, I'd seriously look at the free options, such as RawTherapee, darktable and LightZone. All of which offer far greater lists of features, good results and good support and regular updates.
If you already own one of the big boys, then I wouldn't bother looking elsewhere at this time.