I used the Master X on a TDM system recently. I really loved it, more so than any mastering plug I've ever used. I normally don't like muli-band compression type plugs, but thought this one was useful if used sparingly. The plug-in is either TDM or requires a powercore to run. I'm looking for a similar solution for AU/Logic 7. I'm not thrilled with any of the mastering plugs that come with Logic. For those who have used the Master X, what are some other mastering plugs out there that are equally effective? Is anyone using the UAD-1 plugs?