Thanks for this book link. I didn't know about this and it will go on the to buy list.
valuefinder,
BRK is a quite complicated group of companies, so it takes a lot of time to study up on the different parts of it, to get some kind of feeling of it as an investment.
Personally, I would suggest to start reading the financial statements available at the BRK website, including the yearly shareholder letters written by Mr. Buffett himself.
It's very informative, but also an entertaining read, though quite time consuming.
Max Olson [Max Program on this board] has created a compilation of the shareholder letters since 1965, the first one issued in 2013, a 50 years edition i 2015, and a later reprint available here :
http://www.lulu.com/shop/warren-buffett/berkshire-hathaway-letters-to-shareholders/hardcover/product-22445483.html
- Enjoy! :-)