In a lot of states, aftermarket HIDs are illegal, I say go ahead and put them in. You won't get pulled over unless you're running pink, purple, or stupid blue. Also, depending on your stock housings, you may just want to invest in a package deal with the lights and housings so that you don't have stupid glare.
Its just like tint.
"WHEN you're thinking of replacing a blown fuse with a higher rated fuse ask yourself if you know more than the engineer who designed the equipment."