My Catz Galaxy White 9005 conversion bulbs finally blew out on me a few days ago. I've had them for about a year and the right bulb developed a big bubble on the side of the bulb. But I'm not too terribly disappointed.
But from my experience of using 9005 bulbs in the 9006 (low-beam) socket is that SOME people do get bothered by it. Just as the 9006 bulbs have a coating to produce a certain cut-off, the absence of that coating at the tip makes the bulb glare more (probably) than legal limits. I don't exactly blind people off the road but it definitely does give some unwanted glare to oncoming and same-direction traffic.
Would I do it again? Sure. I don't have very good night driving vision and more light helps. I'll eventually go with HID's but they'd probably produce more glare in my housing than these 9005 conversion bulbs. So for now I have regular 9006 OEM bulbs in my 9006 socket but will eventually use my unopened 9005 SilverStar bulbs for another conversion or go with HID's.
BUT IF YOU DO NOTICE SOME GLARE FROM YOUR HEADLIGHTS, IT IS RECOMMENDED YOU ALIGN YOUR HEADLIGHTS LOWER AS COURTESY TO OTHER MOTORISTS.
And to MonStar, why the heck would you put 9006 bulbs in a 9005 socket? The coating at the end of 9006 bulbs would decrease your light output in the 9005 socket. For high beams, use 9005 bulbs to maximize your light output. Otherwise, your high bulbs won't flash or brighten the road as much.