Eh, I think PUSA is hurting decks this way, Specifically deck-out decks, and spread deacks [ex StallGon or Dusknoir]. These decks needed the 10 extra minutes to get set up on their opponent's side of the field, and get multiple prizes. On the other hand, Turn-2 setup decks went way up in popularity. If they can get ahead 1 or 2 prizes, and just manage to stay alive, they'll win the game.
I don't like the rule myself, the extra time is needed for a lot of decks, but I do see it being useful to prevent stalling.