I was an early backer of this and have been using it for a while now. I love mine. I did a demo with my Mya Moe baritone on YouTube. It quickly became my most watched video. There is clearly a lot of buzz around this device since it was released last year.
In hindsight I could have bumped up the effects more to get a better contrast between dry and using the effects. It works on my tenor too but I did not attempt getting the cross brace installed, I used blue tape to test it out. It also works great on my parlor guitar.