The snubbers are important on the wire and super braid Dipsys. The reasons are covered well in the above posts.
The Dipsy is a great tool to add to your spread, but it is easier for a fish to swim at the Dipsy and gain that little bit of slack to get off. The more hardware between the rod and the fish, the easier it is for the fish to come unbuttoned. Keep a lot of bend in the rod and crank like a mad man if the rod goes limp.