I have the gregson clark spreader mate and it is difficult to maneuver in a lesco spreader around any property when it is more than half full. It is bigger and holds more than the synergy but even half full it can be frustrating. The biggest problem is every dip you hit the whole thing wants to tip over to the front. It's easy to happen because you are not braced to keep it balanced because all of your weight is being used to push the spreader across the yard.
My 2 cents when using in a push spreader. If you have a ride on spreader than it would probably be pretty decent.