I have been using this spreadsheet heavily shortly after Graywolf released it, and to date it's THE tool I use to keep track of things (at least with the things the tool can keep track of so far). I'm really happy with the "Production Summary" sheet, which displays the things I really want to know in an easy to read format. The input areas are simple and easy to to use, along with being well documented. Generally speaking, this is a terrific tool and I am very much looking forward to updates. Thanks Graywolf, for this great CEO resource!