Well, I've had it less than a day, but I already love it! I had expected it to be quite a bit different to an acoustic accordion, but it isn't that different. At least not for banging out my Morris tunes in G major. It came with a Roland WNA1100 USB dongle, which I've not used yet but looks interesting.
I've already hooked it up to my XV3080 with a MIDI cable and initial results are promising. I'll have to create a 'performance' set with the right voices for treble, bass, chords to get the best out of it. The XV only has a couple of built-in accordion voices, but there's expansion cards with another dozen that sometimes come up on ebay.
It also came loaded with some 3rd party voices, though I've not yet worked out how to access them.