Wuala dev here. I just wanted to let you know that we have fixed some of the issues you have mentioned. We'll switch to CBFS as file system driver shortly (that's the same driver SugerSync is using AFAIK). However, this is still a kernel driver. Unfortunately, Windows provides no other way to mount a custom file system. DropBox just syncs an existing folder, but that does not scale to large amounts of data. For example, if you have 100 GB of data online, you cannot sync it to your notebook with a 60GB disk. On the other hand, the dropbox approach is simpler. Delta-uploads (achieved with block-level-deduplication) are planned for spring. You can also disable seeing the public groups in the options now. Also, the UI (which is SWT and not Swing btw) got more light-weight and simpler with the August update. We are not as fast with many things as we'd like to be, but there certainly is progress.