I have a bass fly rig which i very much rate. Sound quality is good and it pretty much exactly replicates the functions of my main board. However, the knobs a very sensitive and it is very easy to knock your settings when it is rattling around in my gig bag which can lead to some sticky moments, especially if you're having a rushed setup.
So, I made a cover to protect my settings. I had 9mm plywood at home, so that is what I used. I'll use a couple of rubber bands to keep it place while the flyrig is in my back pack.