The Clean install was a nothing but problems for me when compared to the upgrade.Makes no difference if your Mac is 1 day, 2 days, 2 weeks or a year old. It matters what you've got installed over that time that creates conflicts with a new operating system upgrade. This is not towards you but SL has been out 3 weeks now, I don't understand why some people that have long term accounts here with hundreds of posts still go the ignorant way and upgrade SL knowing many posters are having issues with it.
It's ridiculous to spend several days working on fixes when they could've easily spent on day completely erasing Leopard or Tiger and installing SL and manually installing their apps back, that's what I did on 3 of my Macs and I have zero issues with SL. One day of work for me and I get to sit here and laugh at the complainers who upgraded.
The upgrade was flawless, which amazed me, even with the bugs I still deal with.