I've been using Macs since OS 9 on an iBook G3 and have updated to every OS update since then and multiple Macs as well. I have never had a single problem with the OS being destroyed by an update. I however keep a pretty clean and default OS. I always here people complaining about how this happened after an update or that happened and believe it's because of the people who install 100 menubar items, modify the way the dock appears, or modify anything in the OS. Or the people who have 100 items in their startup items, or people who download 100 extensions for safari. Or by doing a clean install but using a time machine image because the software or hack is still there. All of these things make the OS either slower, buggy, or non start-able. I'm not saying users shouldn't be able to do these things. They should have every right to make the OS work the way they want to, but they shouldn't expect apple to fix something that they have caused on their own. You just have to decide if the software is worth the hassle. I also have no problem with people who ask for assistance when something goes wrong after doing it, as long as they aren't complaining at apple to fix the problem for them Right now my OS is running 10.7.3, has been updated through software update from 10.7.0 every time. I clean installed when Lion came out, as I have done every new OS update. I updated all through Snow Leopard without any issues at all. My computer is just as fast as it was when I first got it, actually faster since I installed Ram and a 7200 HD.