If you're after a looper for onstage/recording performance, try them out first. I haven't even tried my Ammoon yet just to make sure it works.
My friend's Ditto (original simplest version) couldn't/wouldn't put the loop signal on par with the direct signal, even with the loop level cranked it couldn't get to unity. Maybe his was defective, it's the only one I tried. I got the Ammoon strictly for my build-bench (and maybe some goofing around), so I don't need it for performance where I'd want the loop to be sometimes louder than the direct signal.
Not knocking on Ditto, I do like them and planned to get one 'til the Ammoon practically leapt into my hands. Maybe other Ditto users can chime in on the unity-level thing.