The plus is that your opponent can't use it like they can Tropical Beach, but the minus is a 130 HP mon on the bench that the opponent can gust up and ko. That said, the decks that would get the most use out of it are the same kind of decks that ran 4x Tropical Beach: tanky, healy stall decks that never actually need to attack.
Edit: Oh, it only ends your turn w/ it trapped in the active? ... I actually don't see a single deck that could possibly benefit from this. Amazing Jirachi, and even TEU Jirachi (w/o Escape Board, but w/ Scoop Up Net), would do a better job digging for cards you need and generally consistencizing decks.