When I intall mine, my logic were:
1. My car is not a show car, I don't care if people can see the ballasts and wire.
2. I am using aftermarket parts, I want to able to inspect or replace it easily whenever I need to...
Now, I am thinking to upgrade my HID headlights from 35w to 55w. I can have it done in less than 30 mins.
That's my $0.02