The SkyBeacon isn't shipping yet, so you won't find any testimonials.
The complication with installing a traditional ADSB is you must run a wire to a GPS antenna which needs visibility to the sky. Another wire to a belly antenna which needs visibility to the ground. And of course you need to run power wires, and many devices require a connection to your altitude encoder.
The SkyBeacon uses existing nav-light power wires, and because of it's position has clear visibility to the sky and ground so those antennas are simply built in. And it monitors your transponder's broadcast to get the altitude and squawk code, so no need to wire that up.
I think the complication would come if you don't have a traditional wing-tip light (ie, flush mounted). Or if you have strobes, you'll need to wait for a SkyBeacon with Strobes to be released. So it's not for everybody. But I'm confident in uAvionix as a company - they have been putting out some really high quality stuff, and have consistently demonstrated a quality focus and are driven to deliver products, so I'm very comfortable recommending their stuff.
-Walter