Hi Ashby - In reply, I am using Optoma DV10 projector and have no problems with the RGB cable out of the box. The internet is a little blurry but apart from that superb. I have bought the component cables but can't find an adapter to plug through my projector but apart from that bowling at 103" is class.
One thing I did buy was a switch box so I can just flip between my external dvd cinema setup, gamecube and Wii. It was only £20 and saves a lot of hassle if you use your projector for more than one input.