Wondering the quality of a slingbox? When you are locally on that network, for instance in the same house on wifi, the quality is about the same as an episode of tv that you download on bittorrent or itunes. When you are watch remotely over the internet, the quality is slightly better than youtube depending on your upstream. If you can upload around 60KB/s or more, then the quality is very watchable.
If you want to watch remotely, then you need to open up the port on your router. Select port range forwarding. Open up port 5001 on the IP address of the slingbox.