I just installed my KC H4 kit. I like it so far. It has a sharper beam and is brighter. I used a light meter to measure my stock headlight's output, then my KC 55w fog lights (more measurable light than my low beams). Now my KC H4 lows outperform my KC fogs on the light meter. The High Beams on the stock lights were barely brighter than the lows, it's improved with the KC's.
I've just installed them and only drove around the city, but can see my beams on the ground when I could barely see them with the stockers. Another good thing as these may be a hair whiter than the stock bulbs, but are not that ugly blue/white crap that causes glare in snow and fog. I know some people like that for looks but it's not feasible here as we do get lots of fog in the spring/fall and snow in the winter time. In the past I bought Silverstars and swapped them out as their bluish light disappeared in rain/fog/snow. Stock color is the best for me.
$109 was worth it to me for better safety. If I want more light I'll go get the Philips Extreme 80+ bulbs but I think I'm good for now.
I think it's worth it, but you guys have to make up your own mind. For the money it was a great upgrade for me. *** If anyone has Daylight Running Lamps (mandatory where I live), these function properly.***