We were having difficulty with bootp and using a laptop to configure a 1794-AENT so we ordered one of these as we'd already spent a fair amount of time on it and hadn't gotten it done. This little tool came in the mail and our problem was solved, it did what it was advertised to do. I shared this with co-workers at sister plants and they were impressed as well.
Works surprisingly well. I couldn't get bootp to work with my Windows 7 PC. I have administrative rights and no firewalls so I didn't see how this would work where my PC wouldn't but it was able to assign an IP address. It also lets you set a dynamic IP address to static. They say it can switch a static IP to dynamic, change it, and set it back to static but I didn't try it.