I have, and it was an easy install. You can read about it here
http://www.sonexfoundation.com/uploads/ ... pdf#page15I put the echo under the seat of my legacy Sonex and the antenna under the baggage bay. The GPS antenna is on top of my instrument panel.
I have a Garmin GTX-327 transponder and passed the ADS-B out check with little additional effort. I did have to make a slight adjustment in the echo, using the app, to meet specs.
If you have questions PM me.