I finally got one these and so far I absolutely love it. It is very high quality in everything from the screen, chassis, key caps, travel case etc. Coming from Renoise/Nerdseq the learning curve hasn't been that bad. I never tried LSDJ before.
The web display mode is defintely the most surprising feature I didn't know I wanted. I can work on music on the go, then plug it into my computers to charge/continue working on music in a browser.
I'm surprised how well thought out the sampling feature is. Its pretty easy to record a loop of audio from my modular or anything which accepts MIDI. Also the slicing feature is completely genius.
The thing I am having a hard time wrapping my head around is song mode. Since phrases can have different lengths, getting things to line up and loop in the right order seems difficult unless I make all my phrases the same length (including empty patterns for "muted" tracks.