GIVEN the outstanding sales success of the VT Commodore, it is not surprising Holden opted to keep alterations to a minimum in the updated VX model. The most significant change is the introduction of greater visual differentiation between models and improved safety levels. The up-spec Calais and Berlina models are now more easily distinguishable from their lesser siblings - but whether they actually look better is open to debate. Nevertheless, there is no doubt a host of under-skin upgrades have yielded worthwhile gains in performance and refinement levels.