Even though that is well priced, you can usually get a free episdoe of different projects from Telltale. I would suggest doing this before purchasing. I have played a free episdoe of tales, sam and max and back to the future. Not only did I not purchase the rest of the series, I didn't even complet any of the episodes as I found they did not grip me in anyway. If classic adventure games are your thing, throw the money you would spend on these into QFI!!
Of course Telltale have built a pretty successful company so a lot of players obviously love the games.