A marvelous little product that can get anyone new to the hobby up and running in minutes. I've used Dagger to introduce over 30 public school kids to their first table top RPG experience.
Kids who are used to the fast, low requirement entry of console gaming aren't chased off by the extremely brief and simple rules ("You mean we have to READ something BEFORE we play?").
The rules invite tinkering and modifying to taste, but don't require it in any way and as players are ready for more options in the future they'll have minimal difficulty moving to Dungeon Crawl Classics, Labyrinth Lord, vintage D&D reprints, or D&D Next, since those products share the same gaming "DNA" (class, level, monster, to hit, saving throw, etc.).
Finally, and in my opinion most importantly, Dagger provides so simple and clear a framework that I've been able to use it to get about five brave kids to start designing and running their own adventures for their peers! New players are one thing, but new GMs/DMs are another! Dagger can get kids comfortable making rulings and developing confidence (vs the game stalling as they dig through a rulebook) right from the start.
[5 of 5 Stars!]