As said, they are illegal withouth self leveling system and headlight washers, but, saying that, ive got 6k diamond white ones in my car, never been pulled for them, flashed only twice down pitch black roads. I got mine off ebay for about half that price, had them for ages and no problems so far!
All you do is install these - just take out the old bulb, put in new HID bulb, plug the original loom into the connector for the hid bulb, wire it upto the ballast - just simple plug in and play job, then its all ready to go, then i went to work, got them alligned to on the headlight alignment thing, and they was fine anyway but i just made sure, they had a nice beam pattern too so ok for MOT's.
Only thing is, they are VERYYYYYYYYY bright, well my 6k 35w ones are, compared to normal lights anyway, i would NEVER go back to having normal headlights, these just make the road so much easier to see. Even in the day time they are bright lol.
Just a pic of mine:
