ScoutMom, you're right about needing everyone to use it. Implementing this kind of system with volunteers can be touchy. We gave our dens two months to start using it, with the understanding that Advancements Coordinators would no longer accept paper forms. If that's an arbitary decision, DL's will turn in forms anyway. What made ScoutTrack.com work for us was the way it tracks and shares history with all the leaders, allowing really effective collaboration. It provides a higher comfort level for the DL's - if they mark off requirements for a badge, we order it and make sure that it is presented at the next pack meeting. Another benefit is that ScoutTrack.com automatically shows badges earned that might otherwise be missed, such as instant recognition beads, service stars (with the right year), arrow points, Webelos compass points, and the World Conservation Award. The Advancements Committee is also more effective because we can pay more attention to adult service stars, recruiting patches, summertime activities pins, perfect attendance awards, religious awards, and so forth.
It has to be a win-win, obvously. If the DL's see it as more work for them and less work for the AC, then it won't work. If the see that better collaboration means a richer program with more recognition, then it can definitely work.
If you haven't made a decision yet, I would recommend the 30-day trial. (I'm assuming you are your pack's Advancements Coordinator.) You can learn the screens and develop a plan for how to best present it at a DL meeting. If you like it and the DL's are open to trying it, then get the one year license and move forward. You could technically use ScoutTrack.com by yourself, but your Excel spreadsheet may continue to meet your needs just fine.