This system addresses one of the main complaints my players have of my OSR adventures, that their characters are sometimes not well suited for adventuring and lack much background or connection with the other player characters.
The playbook system included in this is pretty amazing, it is not really an OSR way to create characters because you get to pick your class/archetype first and then roll to build up the background and suitable stats for that character. The playbooks are really quick to run though, and I like that I can hand out self-directed playbooks to players so that everyone can create their characters in parallel. The generation process looks like it creates easier characters, not quite as hard-core as classic roll 3d6 for stats and deal with the early demise of several characters in even a novice adventure.
The book claims to do a complete adventure, from scratch, in 4-5 hours. If this is true, this seems like a rather good system to run at a con. Especially given that the overall system will be familiar to most players, who can help assist new players.
I plan to run this system in my next adventure. And that it has mostly classic rules makes it highly compatible with other supplements (I'm a big Swords & Wizardry fan)
The biggest flaw is that there isn't a lot of direction given for a DM to construct a playbook. But there are about 19 playbooks available already to use as examples, so perhaps as I become more familiar with the technique it will seem less daunting.
Overall: A tremendous value.