They look dazzling at night, but the video was shot from the perspective of someone standing, not from the eyeline of a fellow TF driver.
Yes, many 'hids' can be quite dazzling. However, filming headlights tends to diffuse the beam without a proper camera lens filter. So, the video is quite deceptive. To that end, there'd be no real point filming from a lower perspective.
I did test them further by driving around for a couple of hours after midnight last night and nobody flashed their lights at me for dazzling them. Not even on pitch black country roads. So, initially it appears that they're not overly bright. Just considerably brighter than the oem bulbs.
Interestingly, that beam pattern looks as though it has changed looking at the road in front of the car.
I've had to adjust the lighting using the youtube built in video enhancements. Otherwise the original lights are just too dim to see at all. Consequently, it's also amplified the xenon beam pattern on the road too. Quite possibly it may have changed. But I won't know for sure until my mot, next July.
In summary - They're quite a cheap but apparrently effective mod. They were a doddle to fit. They light the road pretty well. They don't appear to bother anyone coming in the opposite direction (although, I'm not sure if I passed a TF yet, due to it being very dark). They may or may not last long. They're 35w 4300k and don't seem to be having any more impact on the cars system than the ordinary bulbs. So far, deep breath, fingers crossed, so good.