It's a great read, but also deeply frustrating. I can feel in my bones what they're aiming for — I loved Agenda, and the idea of Notes is a brilliant one too, but it seems so frustratingly hard to actually deliver a great product that delivers on it.

(It's also very easy to criticise Chandler's approach with hindsight, but the book does a good job of making you appreciate just how much was up in the air at that point with approaches to building networked applications: see for example the amount of effort they poured into making it work locally because the idea of constantly having to chat back to a central server was anathema to them)