I've never used this particular app, but I have used something similar called GameBook, or Golf Gamebook. We used it for large event (50+ player), handicapped, stroke play events. It did only require that a single person enter scores per group, and all handicapped scoring was entered ahead of time. It also had messaging/smack functionality, but that was rarely used. Most folks are more concerned with simply keeping the tournament moving along.
As far as live scoring, it was perfect for that. Everyone knew exactly where they stood as the day went, whether you were a scratch player or a 30 handicap.