I have been using one for a few months and find it quite a novelty – it is quite big, about the size of a 31mm Nagler, and with the cooling fan running quite noisy. When using it as an eyepiece you are left in no doubt that you are looking at a screen – albeit a very high quality one, and there is as you say coma towards the edges of the field of view – so eye placement is quite critical, and eye relied is not great. The best description of the view I could come up with is that it is like that produced by a SeeStar50 but one on a medium to high dose of steroids. Of course you can switch it around form one scope to another, and I have used it on 72mm, 100mm 130mm and 140mm apo’s and it performs well, all on a driven Alt-Az mount which the software copes with well. So on M51 for example you get a very respectable image of the spiral structure, dust lanes, H2 regions within 2-3 minutes, and all in garish colour (though you can also view in mono). Beyond a few minutes the there is little improvement in the image – but if you are interested in outreach this should not be a problem. You can share the view on other devices such as smartphones and tablets, which is another plus for outreach.
I would imagine experienced deep sky imagers would not get a lot out of this device – and there will be equally or more competent setups available at a much lower cost, but if you are not an imager (which I am not – far too complicated!) or lazy (which I am) it is a good route in to the EAA field, and for showing novices things you would need a very large instrument to reveal in less detail.