Kibbet, fair point in regards to looking out the window more when VFR.
As far as the IFR part, I was thinking more along the lines of shooting an approach, single pilot. To have an artificial horizon, airspeed, tracking information (ILS, LOC etc), and a VSI all showing on the windshield would I feel would make the approach easier when when nearing the DA/MDA, ie instead of head in the cockpit flying the till DA, then looking up and trying to make out approach lighting, you are already looking out the front window.