I have been using Redhat 8.0 for a couple of weeks and the "(null)" beta for a few weeks before that. I am very impressed with the usability of the desktop, but less impressed with its stability. gnome-terminal leaks memory like a pig, forcing me back to xterm. X tends to lock up if left in a GL screensaver too long.
The integration of widget sets is sweet and the font AA is very nice. The only blemish on this is the inconsistency and ugliness of OpenOffice (which is otherwise a brilliant product) - I wish Sun had bit the bullet and ported it to Gtk.
By the 8.2 release, I would find it difficult to argue in favour of spending AUD$1000 on MS Windows and Office for a business desktop.