I was using Frey's Steam but it made my steam froze from time to time, and SteamWatch drops the connection "after" it connects which means some data will still be metered! But then I found Angus Wolfcastle's script and it works wonderfully since it uses the windows firewall instead of just silently drops the packet(which results in frantic reconnection effort by steam) and Steam's never freezing up on me again, thought I'd share it here.