There are a number of articles like this around at the moment…
FolderShare vs. Dropbox – GigaOM
I’ve been a Foldershare user for years, on the whole it’s been very good except when they had “server issues”.
However, the new version is awful. The old version listed the synced directories, the number of files they contained and how they were synced. In a single page you could see the complete status.
Now Microsoft has got their developers on the case. It looks prettier but the summary view has gone. This simple change makes it much harder to use. At least they were sensible enough to keep the Mac version.