I have been a fan of Tin Man Games since their initial offering An Assassin in Orlandes. Tin Man Games designed their own combat and skill resolutions system for the Gamebook Adventures line and it plays quickly while adding drama to the potential combats in their tales. In the next month or so, I'll do an "Adventure Gamebooks as RPGs" entry for the line -- though that will have to wait until after I finish the Swordquest Table Top adaptation I'm working on. The AGs as RPGs entries are conversations of how one can adapt the systems within gamebooks to table top play. I was inspired to attempt them by the old Advanced Fighting Fantasy RPG which converted the Fighting Fantasy Gamebooks system into a full rpg. It was workable, but I like to tinker.
Do yourself a favor and pick up a couple of the Tin Man apps. Their consistent quality was likely one of the reasons that the company was given the license to do future Fighting Fantasy Gamebook apps starting with the upcoming Blood of the Zombies.
Color me excited.