I have had HID in my GP for over 6 years, with the 4 headlight system it cost me close to $500 for the 2 bi xenon and 2 HID bulbs back then. The only problem I encountered was the cheap plastic conversion lenses. Last year I finally retired one of the original 4 ballasts I bought. The other ballasts died from corrosion. I don't use the plug and play connectors, I cut the headlight connectors off and hard wired the connections so they get a good feed of power. My friend who sells the HID and installs them would not sell them is he had people coming back with warranty issues. The are a few people who seem to have problems but they are the ones who install the HID themselves.