Benefits: Tastes better, creamier, fresher than scalded. Pasteurized milk has a sort of cooked taste.
Risks: Depends on exactly how clean the dairy is. It has to be pretty clean to keep the milk from spoiling quickly or getting infected with Salmonella, Listeria, etc. Hands, containers, udders, milking equipment all should be scrubbed with HOT water, sprayed with disinfectant and rinsed again with boiled-and-cooled water. Milking parlor needs frequent scrub-downs. And then disinfectants have to be rotated: chlorine (bleach) one month, quaternary (e.g. Lysol) the next month, peroxide the month after that...A real pain in the neck. You don't want to find out the hard way that you've got contamination, we lost a local dairy farm because of a single Listeria contamination, some old people got sick and one died. They couldn't afford to stay in business after a month-long shutdown, so that was the end of 'em.