Is there any doubt that Mo is simply the BEST out there? He's always joyful, but can be perfectly serious when dealing with players, he shows so much love for the profession, and he has incredible eyesight. If you don't have Hawk-Eye, Lahyani is your next best option. He's never afraid to make a "Correction, was good" call, and is almost always right.
And that voice. Can't mistake it for anyone else. "Thirrrrrty - loooove".