ITA. I get good quality video and sound, plus no ads. I can't even watch regular TV anymore. The ads drive me nuts. How many members do you think this site has?
I suspect many of the problems are caused by incorrect settings on RP. More buffering time and pick the right connection. If RP picked cable and in reality you have slow DSL, it will cause a bottleneck. Streaming video is not a continuous feed, it's a bunch of packets that get to your computer using different routes.
For those of us using linux, it's important to remove the totem plugins, as they'll try to play the RP files, and install the non-free realplayer. Type about:plugins in the address bar to make sure you have the RP plugins installed in Firefox. You can do that in windows too to check your plugins in Firefox.
