I bought the vision X from marlin and they are great. I am beyond impressed with them
A little late to the party here, but I did the same. I made a post awhile back about the conversion and compared the VisionX to some "Rampage" conversion housings offered by Summit Racing but since the pics were all hosted at Photobucket and I deleted my account there, the pictures are all gone.
Long story short, the VisionX housings are very nice and when combined with the halogen bulbs and relays to deliver full voltage you get a lot of usable light out of them.
I was only getting 11.4 volts at the headlight connectors without the relays. That's a pretty significant drop.