To clarify a bit more:
Trinity: consists of a Double Split Coin in an Expanded Shell.
Super Triple: also comes in Half Dollar size and consists of three identical-looking thin coins that stick together to look like a single coin (two of the thin coins have the thickness of a regular coin and bind together so well that the double coin could be casually handed out without exposure; not so with the triple).
Dream: a Slippery Sam gimmick is like a half shell that a very thin coin slides into. Therefore, in the Dream Coin set, you could not show both sides of the "half shell" gimmick, could you?
If I'm mistaken in any respect, please let me know. Also, how is Wong's Perfect Power 3 different from these sets? Is the Coin Bomber set made up of four Super Triple Coins?