I am using this app to run my store in both English and French.
The user-face and overall UX of the app is good. I translated all parts of my site manually so cannot comment on the quality of automatically translated content. For what I needed almost everything with this app was easy to figure out and use, except some sections of my site which I couldnt find inside the app to translate - For these I emailed the devs and we worked together to get everything in shape. There were a couple of small bugs during the whole translation process, but the devs worked quickly to resolve these for me.
Compared to other more expensive translation apps the cost of this one is reasonable and I am happy I chose it.