From a pedagogical point of view it is a great board game, since children can train their spatial imagination. Before you take any train consider how to get to the certain characters and have to take into account the shifting of the gears.
Also this game has a long fun, because every game designed completely different.
However, you can save a few euros if you just buy only the original (as long as the child or oneself not a fan of the yellow sponge is).