Living sober sucks, much like the book, is a quit drinking site, about living life sober, is it not? That you latched on to the title, and discarded the rest of the content, should tell you something.
Regarding this recovered "and actually happier" thing you're concerned about, that "happier" part is your addiction talking.
It is the addiction saying "Life is no good, and if you're not happy, you may as well drink, so if you can't get happy, you can't quit drinking."
The warped "happy" logic just points to more drinking. It is the addiction organizing your thoughts in order to perpetuate itself.
Happiness may be a life ideal, but it is not a recipe for quitting drinking, or a guaranteed outcome. Quitting drinking simply removes a ball and chain that may lead to devastating losses.