Yes, Explorer Desktop is just too slow to open and at handling large vector datasets, and the interface is too clunky (Oh, it also always changes the W7 desktop to classic). What most users like about ArcReader is the interface similarity to other programs (SMT) and ArcMap used in O&G exploration. People that are doing this type of work are not always interested in a WebApp (which are also too slow), just a clean interface, and good performance. I was also hoping for some increased functionality and performance; too bad ArcReader is dead software.