From what I understand talking to the guys, Lexus designed a chassis to be taut and handle well, but overlooked the geometry, leaving it with good handling and comfort, but at the expense of tyre wear. Tony completely rewrote the geo settings, leaving it with sharper, more focused handling, increased grip without sacrificing comfort, and prolonging tyre wear.
Can't go wrong with that!
Mine really wasn't far out, just a few degree's of adjustment on a few points, so I won't get the full "feel" benefit that others might, but already I can tell it feels that little bit more "flat" when driving, and the tiny degree of pull to the left I had is completely gone, with the wheel centre being completely centred. No change in comfort; it's not harder or stiffer; rides just as it did before, but feels that little bit more taut and true.
More importantly, if it means I don't need to change my tyres prematurely, I'll be extremely happy!