please let us know your findings. i have owned srv for about 6 months. its a recession proof industry, the company does a good job with its "cluster" idea to control cost. about 85 percent of industry is mom and pop . growth and earnings around 22 percent.
roe about 15 percent, which is one of buffetts big items. it does have a fair amount of debt.
i am also reading buffettology but started after i had bought the stock. interested to see what you find.