First, all dealers aren't the same, and all mechanics aren't the same. Some are very conscientious, some could care less. Like I said, the dealer "may" be better. But equally, they may not, either. You could have a great dealer, but maybe they have a not so great alignment guy. Or, perhaps you just need to go back and tell him it pulls to much to the left. If he can alter caster a bit it will help it.