It was very easy - I installed the whole kit in about 15 minutes (took my time and I'm not much for DIY). All plug and play, and no error codes - very happy with the brighter white lighting.
'07 650i vert, beige/jet black, sports & cold weather pkgs, comfort access, logic 7, sat radio, Miro M6 wheels (with Michelin super sports), M6 spare tire, tint, windscreen, triple resonator delete, m-tec v3 AE's bulbs, corner bulb delete and m-tec fogs
'11 Acura MDX Advance with Entertainment pkg for wife - no mod's
'04 Acura TSX (daughter) and '12 VW GTI - Autobahn (son)