I use MS Entourage, Palm OS4, and Moto ROKR phone. This program is the only "one stop" solution I've found for reliably syncing all of these devices, and it is MANY times faster than the various other programs or built-in partial solutions. Yes, it assumes that the user is not clueless on the using their own hardware and software. A reasonable assumption, and their instructions are clear and easy to follow. Each device is unique, do not make the mistake of thinking that the data will look identical on every device. All E2Sync does is match fields as best as it can. I have found that the easiest solution to prevent "lost data" is making sure you know the sequence and type of sync between devices and programs. You may have to run 2 sync operations and turn off one device for each, etc. For example, I first sync Entourage to my Palm 515, then sync the Palm to the ROKR in a separate sync process. This assures the sync path I desire. All contacts, calendar events alarms etc. sync without a hitch.