It's an improvement over the abysmal ArcIMS client, for sure, but is less impressive than all the hype suggested. The HTML table of operation panes looks and feels clunky. Reordering the panes conflicts with Firefox's right-click menu. The scale bar is nowhere near as sexy as Tim Schaub's (in PrimaGIS and OpenLayers), and the scale slider is nowhere near as smooth as the one in Google Maps. I was expecting it to feel more usable and look more appealing.