Have been using DeltaWalker Oro Edition for about a year now.
I have been in contact with the developer for inquiries as well as a few questions to help me make the most of the application. In all conversations, the developer has been extremely helpful and responsive.
A few things that I use it for are as follows:
1> Portability...I keep it on my USB drive and use it on only 1 machine at a time and commonly use it for home folder migrations on Windows servers. Used to use competing products (free and commercial) but found that using DeltaWalker was quicker and more stable than competitors.
2> File transfers from differing OSes...since the works on all the platforms I need to support, I can commonly transfer home folders, application directories, etc., from a Windows server to a Mac server and vice versa. Apps can be transferred from same platform to same platform easily, as that example above is more for platform-independent home folder transfers. Even if I'm transferring via FTP on one server to an AFP connection on another, it works fantastic. I'll commonly transfer home folders from Windows or Netware to a Mac server with ease.
3> Stability...I was concerned that this app, being written so heavily around Java, would be a frequent crasher or slow down when I needed to make sure it was going as fast as possible. That was a worry, based on other apps that I used in the past that were poorly coded. I have personally transferred Terabytes or data with this app without a hiccup. It performs and I can't even make it crash, regardless of how I click, when I make changes, doing random re-comparisons while it's already calculating my differences, and so on.
4> Visual differences...Last year, my company started using Dropbox really heavily and we still do to this day. We certainly love dropbox, but we also commonly work on files at the same time without realizing it. When people save, we will end up getting conflicting copies of a Word Document, Excel Spreadsheet, etc. This was a problem in the past, but isn't anymore with DeltaWalker Oro Edition. I take the comparison between the 2 files and I can see visually what needs to take place on one file versus another and commit to the changes, or make any necessary changes before committing. For anyone using Dropbox in a team environment, I was really hoping to find such an app to comb through the changes on a single or set of files when conflicts occurred but never figured someone could make it visual enough to be decent. DeltaWalker proved me wrong.
I saw the promo on MacUpdate last year and purchased after trying it out. I have no problems with giving a responsible developer money and support to continue funding a product that I use constantly to help my workflow efficiency on a daily basis.