I've run for years with the omega drivers. Generally speaking I installed them once & let them be. IE like hajo said no needless jumping around with drivers.
Pro's for the omega's in my book.
A Designed to install over original ATI drivers with no real fuss.
B Easier to install just the basic driver with out all the hydrovision, control panels, players, etc added garbage that ATI sticks you with.
Granted you can still do it with the ATI's, but IMO the omega's made it easier.
So, if you built your machine a year ago, and you want to try updateing video drivers. And cut down on the system overhead load, omega's are IMO a good choice.
If your installing every new driver that comes out in hopes of fixing something, or changing something. I'm with hajo, chances are its not going to help.
Better to go back & figure out whats actually wrong. IE heat issues, poor fan, etc.