Safety
How safe are share? is it safer then emule?
Share is an anonymous network, so it would be difficult if not impossible for anyone to know what you are up or downloading. Anti-p2p groups could theoretically track what you are uploading to eMule, and notify your ISP, but so far in the U.S. at least, they seem to be targeting bittorrent more.
I have never downloaded any viruses or trojans on Share, but it is only common sense to scan any exe or zip files you download no matter what network you got it from.
Winny has a known vulnerability that can lead to it getting infected, but both Share and eMule seem to be free of any security bugs like that.