I was reading a little bit about the bench a few years ago in one of the Martial Arts rags. Many weapons will help you develop strength and power thru practice. But the bench is one of those things that you really need to be strong first, to even begin training with it. Definitely not a weapon for everyone.
I suppose we will start seeing the Modern Wushu people using benches made out of Balsa Wood, and flipping them 20 feet in the air and catching them one-handed...sort of defeats the whole purpose of training with the weapon, developing tremendous power and strength by training with a heavy implement. That's always been my beef with the use of lighter and lighter weapons. The training begins to lose a lot of integrity and becomes downright silly when they become mere toys and stage props.