Yes, it never crashes but it needs to be "reset" in one exception that I've found.
I connect to my Windows trading computer from work and when I log out the home system is locked, i.e. you need a password to sign in. So when I get home I have to enter the password with the Windows' computer keyboard and then synergy works again.
However, if I don't do the remote connection thing then I can lock and unlock the Windows box without synergy ever having a problem. The synergy daemon runs on the linux box which is up 24/7. When windows boots it automatically connects. Basically it would be problem-free for most users, I think.
Try it, it's free.
--opm8