I recently decided to test the new ATI drivers with Fedora 13 and for the most part them seem to work fairly well, however there are a few things that seem to be a bit of an annoyance.
For starters it seems that using this driver causes Firefox to have frequent black spots when scrolling down the page. This also seems to be in connection with how Metacity interacts with Catalyst, changing the window manager to Compiz for example reduces but not eliminates this issue.
This coupled with the fact that my monitor was acting up in an unrelated way was not a good mix. I think for now using the default drivers is probably best until Catalyst 10.8 is released to see if this fixes the issue.
In addition it seems that the 10.7 version of the driver slows my computer down significantly and with my computers specs this should not happen less i have a whole lot of stuff running. Out of fairness I am using Fedora 64bit so not sure if this issue is present or not on the 32bit version.
It should come as no surprise however ATI lately seems to be favoring Debian based Distributions over RPM based ones in terms of quality. Ubuntu always seems to get drivers from ATI that are sleek and work very well while Fedora and other RPM distributions that might utilize newer X.org versions tend to get left behind even when the drivers “work” for the Distro.
Now to clarify I am not bashing Ubuntu as I use that distribution as well, nor am I trashing AMD, I am merely stating that it seems AMD does not really actively work with other distros to make things as flawless.
Aside from the issue i mentioned above I have not really seen much in the way of disadvantages. The metacity issue however could be due to a numerous amount of factors so pinning the blame completely on ATI/AMD would not be fair.
The views here are expressed solely by myself and do not represent any other view point weather it be company or individual. If you do not agree with these opinions note they are solely expressive of my views.