hemidrag

U have been running Red Hat 7.x server for quite sometime now, is there any reason I should change? They are all working fine and to my expectations. ( I am lazy :P )

taylor

Humm, It depends. If you are not current with all the patches and updates and your hardware can support it, I would go to rh9.

If you have no present issues and are current with updates and security patches stick with what is working.

cristobal

Well, I don't think its necessary to change unless you are faced with major issues like it keeps crashing or things like that.
I agree with Taylor about shifting to RH9 only when needed.