I had Rigids on my my Gobi roof rack for a long time. They're fantastic. I'm probably moving them to the Commander project if I don't sell them with the roof rack.
I also have VisionX lights, and many people in my SAR unit have them. They are also great lights.
The VisionX seem to be brighter and a bit better focused, and the Rigids seem to be a little more durable (Though, I haven't broken, or seen either brand broken). Both are completely waterproof and take a beating and have great electronics, optics, and heat sinks. Both companies have fantastic support and are guaranteed for 50k hours