hidextra.com : don't waste your time
 

h4 kit problems:
-there's no glare shield to begin with. it's like i'm driving with my high beams on at all times
-the halogen high beam is a joke, the low beams do a better job
-i had to use my ddm ballast just to make it home because the hidxtra ballast died within thirty minutes of use
-all of the plugs and connectors feel cheap, the h4 plug specifically. the prongs move around and it felt like it was going to break before i even plugged it in
-one bulb has been flickering and isn't the same color as the other one. it has also been inconsistent, the color is different after every time i let it warm up

h11 kit:
-the plug isn't wired properly so it had to be flipped around to work. however, now it doesn't clip in and just slides into the plug instead
-the "3000k" is more green than yellow
-oh, they're flickering also

overall, all bulbs flicker and two of the ballasts gave out within one night. it may be cheap, but just be careful. maybe i just got a really, really, really bad set on both of them.
their customer service however is fantastic, i'll give them that.

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take my advice and just go with ddm, especially if you're local. i have my headlights pointed all the way down, where i can only see about 10-15 ft in front of me and it still glares into cars.