I wanted to save time, and they were only charging $15 to put in low beam bulbs (which I provided), so I let them do it. However they misaligned the cutoffs (see photo). Driver side was aimed significantly higher which would cause some blinding (dangerous!). I re-adjusted them myself later, but so much for saving time. If I'm paying to have bulbs put in, they could at least make sure that the bulbs are aimed properly.