Something of a pet peeve I suppose you could say, are people who say they're waiting for some update or another to settle or bugs to be worked out, etc.
The update that is released on day 1 is the same update that will be available a year from now. There is no "settling" or working out of bugs, or whatever else.
Yes, sometimes there are odd interactions that were not expected, like the issue with 10.6.5 and PGP disk encryption, which is the fault of the PGP developers for not testing their product with pre-release builds of 10.6.5 that Apple releases to developers. Outside of that, there is no reason to wait more than 1-2 days, unless you are using an afflicted program, and are waiting on an update.
To not do so is to put your system at unnecessary risk of compromise. Just because you're using a Mac doesn't give you license to do something stupid with impunity. The consequences may not be as immediate on a Mac as Windows, but there ARE consequences. Using a Mac does not grant you some kind of special immunity.