I thought I should come back on this thread which I revisited when i did a search on Edgun.
I must confess that i am warming to the design. It appears to be well made and is certainly very compact. From the video clips on Youtube it also looks accurate. It is clearly VERY expensive and in legal limit I wouldn't consider it but if an FAC .22 or 25 came up I might well give it a go.
For the same reason I might well consider one of the Kalibrguns as well.
I recognise however that the chances of a FAC one coming up at a price that makes any sense is very small.