Glad he's getting the job done for you =) As for quarantine, of course it's the best idea, from my end, I can tell you there have been no new snakes added to my collection in the last few months (hatchlings don't count!) and I've seen no signs of illness or parasites. He's been in the rack in my bedroom, so I am around them constantly when I'm home to notice any changes.
Does he have a name yet?