I just starting using this tool and I have found that the graphical interface for this tool is well laid out and easy to understand. This tool provides a more efficient way for me and my colleagues to provision and synchronize sites across farms.
When dealing with large amounts of data I noticed a significant reduction in UI responsiveness. For example, if I selected 1000 items from a forms library on one farm to synch with another farm, I can drag and drop selected items but the visual cue that I am dragging and dropping doesn't show up until 5-8 seconds after I have dropped. Therefore, it took me awhile to realize it was working.
Once the drag and drop had been performed, it took a very long time to process.