Ours comes in glass pint bottles too, but if you get large amounts delivered each day, they may give you the 4 or 6 pint plastic jugs. As long as you don't leave the milk out all day in the summer, I doubt it would go off.
I have a pint of semi-skimmed delivered for each day. We tried the whole milk once baby came off infant formula, but I wasn't very pleased with it. It's probably more to do with my phobias than with the milk quality. Silver-top -- as whole milk is called -- has milk fat that floats to the top. To me it looks like curdled and that gives me the heebie-jeebies. So we get baby's milk from the store which tends to have less floating milk fat.