I can't comment on that particular option. But it does resemble the format. Dunno in terms of cost because the link you provide does not mention it. If you could share that information then it would allow others to compare.

It's in the FAQ section.

That's only for ruby webapps, so not exactly a replacement for Hacker School.

In contrast the one I mention uses different languages. But if you are looking to be a rails dev that one is not a bad choice. And it's we priced.