I saw this application just after it came out and jumped all over it. Too often developers take the time to move files one at a time or in large groups only to have to sift through files that are not required on the server. With this product I was able to quickly deploy an entire project with only the files REQUIRED saving time and headaches.
Recently another great benefit showed. I was working with ONE file that had some pretty tough code, I kept testing it on a live server after developing locally. I kept this application open and had only the one file and the /bin directory selected, each time I did a build, I'd hit the UPLOAD button and it would quickly (few seconds) push just that one .aspx and then the project .dll saved me a lot of manual labor... THIS is the way that MS should have built the deployment part of VS.NET!