I definitely get the concern, it does not have any real replayability, being puzzles that you destroy as you play. I remember us talking about the price to playtime ratio after the first game, and deciding that it was "cheaper than going to the movies, and more enjoyable". For us it's like a treat, we usually buy one when we go to the board game shop, we're excited about it on our way home, and we finish it that evening.

This was our third exit game, we've been getting the same nominal difficulty. We're a bit more familiar with the common tricks now, and we finish the game a bit faster, but every game has something different and interesting, the individual puzzles have pretty consistently nice quality, so it's still very enjoyable to play.