Is it worth using WinGate?

I started to use WinGate two months ago as a proxy server/firewall of our small company’s local network. When I was making decision to use this proxy I was said that WinGate is the best proxy for small businesses or home offices, that iy’s easy to administer it etc., but at this time I’ve had some problems with it:
1. Sometimes user sessions suddenly start to blink and then blinking stopped.
2. I can’t confogure WinGate for support ICQ. (We use ICQ to communicate with programmers who work ouside office).
3. I didn’t find any command to defines Internet sites from that I don’t want to receive traffic.
So I want to know is it worth to continue using WinGate, or I should choose another proxy server (for example MS Proxy Server).