PanelBuilder32 is for the standard PanelViews, which are just a dumb, operator interface terminal. RSView Studio ME is for the PanelView Plus platform, which is a machine-level HMI platform with better graphics, trending capability, etc. The standard PanelViews are not "on the way out" by the way. Rockwell stated as recently as last year that there are no plans for obsolescence in the near future. They still sell way too many of them and much like the PLC-5, the installed base is huge.