I think that makes things better
I'd list "do not come from Apple" as a bonus. My reason for doc using on Apple's update utility is just to minimize the installed software. One update utility is better than two or more. Still, two is better than "do you wish to update now" windows every time a program is opened (say.. Itunes.. for example).
Nice that they do auto-update of the notified programs though. I'd personally go for a "notify me of available updates but let me choose when to download and install".