It does decribe the difference between the way we play and how you would play if you actually had $1,000 - $10,000 of your own money on the line. Basically, play tight but aggressive and don't bet on bluffing everyone out of pots.
I would equate your style Hagar to a Dan Harrington where if you are raising before or on the flop, you most likely have best or second best hand out the gate. With that style, you basically need premium cards to play and win or you need to see alot of flops cheap to be able to hit and run. If you throw a bit more aggressive play in there post-flop, you have what the book is trying to describe.
It talks about people seeing too many hands to the river where they shouldn;t be based on pot odds/equity. It talks about proper betting amounts in relation to the pot, blinds, and raising/calling for implied odds vs. forcing someone out.
As I said, it is all the normal stuff but maybe you will find a few golden nuggets in there re: lower limits that will give you a bit of an edge.
I liked it alot better then most of the other books I read meaning I would of liked to have started with this type of book a long time ago.