Not a Horizon guy, but former Island Air guy here, and that Beta Lockout Mod SUUUUUUUCKS!!!! If you trip it off on the ground, your engines will go into MANUAL, and you'll have to go back to the gate to reset the CB on the DC Contactor Box in the nose... it can really be a pain in the a$$. On top of that, one of our airplanes is possessed as a result of that mod. Prime example, I'm sitting at the gate with engines off doing paperwork and the GPWS goes off "Don't Sink, Don't Sink." You can just imagine the wtf looks we'd exchange up front, and not to mention the passengers and the FA. Mind you, you can't shut it up except by pulling the GPWS CB's. There are some other issues I wouldn't care to discuss here... however, that mod blows. You'll see how bad when you get it.