I LOVE BookEdge. You can tell that this tool had been developed with feedback from actual authors. I previously used BookReport and had all kinds of buggy issues with it in Firefox. No problems with BookEdge, and the developer is adding new features ALL THE TIME. Right now I'm heavily into market research, and I really appreciate the ability to spy on the sales ranks and reviews of other books so I know who to emulate... and what readers love/hate in my genre. I like having a quick dashboard view of my own books' ranks, star rating, and reviews per marketplace. Plus, obviously, estimated royalties are great, and especially the total units sold (includes page reads divided by total KENPC for the book). The developer is also very quick to respond if you have any difficulty figuring out anything with the tool. And there's a VERY generous affiliate program, so I'm even more inclined to sing its praises. Really looking forward to the upcoming new features I know the developer has up his sleeve...