I don't personally have one, but on the Paint Plus Upgrade page it does make it sound like it is an added cost. Personally, I'd ask someone that got theirs painted how it's holding up. It doesn't say what materials they're using to paint them, but I got a free painting on a packer from Packer Locker and it almost immediately started to deteriorate after daily wear and a trip to the shower.
I don't really see the point in a packer that can't be worn all the time, so if the paint won't hold up with daily wear I wouldn't spend extra for it, regardless of how much the extra is.