lol relax for f**ks sake, they are just headlights and yes they are A-OK. Maybe you should put a set in and try them out, if you don't like them, then sell them, not hard to do.
You adjust the headlight a bit down to make up for the extra brightness and point them a bit more to the left so they don't point as much into oncoming traffic on the drivers side. Pretty bloody simple.
I purchased five kits off of Dave for an SS, Monaro, Supra, Mazda 3 and my own and also purchased a kit elsewhere for my bike down the track. Adjusted all the kits to compensate a bit for the extra light out put and not one of those people have had any problems or complaints from other people/the law. Bringing shit like focal points into this discussion is a bit of a joke and your looking into it way to much, obviously it aint going to be perfect like a $3000 headlight of a BMW built in a factory for a specific bulb, no shit.
It's not just about the extra brightness. It's also about the much better clarity, lower power consumption, much longer life length of bulbs, easier on the eyes, same price as most top of the range halogen bulbs and they have a nicer modern colour compared to a gay yellow light. If you don't want/like them fine, so be it, other people love them and I know i'll never own a car in the future without HID's, preferably factory ones on a big dollar Euro car