Only that it doesn't support Acronis-style incremental images. So imaging takes more time and space. It also (last I checked) doesn't provide a way to automatic

Only that it doesn't support Acronis-style incremental images. So imaging takes more time and space. It also (last I checked) doesn't provide a way to automatically delete old images (but that's easy enough to script). It does do full images very quickly and reliability though, which is worth it for me. I tried for a long time to like Acronis. Even submitted several bug reports. But I had no end of problems, and even aside from the annoyance and wasted time, I don't want to trust a program with such quality control issues with my backups.