I've heard really good stuff about their in-person training too. I'm actually a big fan of the intensive in-person training. It's expensive, but I've found it to actually be worth it (for professional work at least).

I was looking for a modern training program (I started iOS App dev back before apple had a 3rd party lib) for a new guy, and this was my choice for best one. I also like the Xcode 4 book that recently came out.

> I should have read it before writing my first 4 apps through trial and error.

I wouldn't say that. I consider learning by trial and error far more valuable than reading the best books on a topic.

If you read the guide now you get more out of it. You have done the groundwork yourself - now it's time to hone your skills :)