I have LED side lights fitted in the vRS and 5000k HIDs, together I think they look excellent. I have also now fitted LED sidelights in the GT and replaced the halogen bulbs with Ring Xenon Max which are much whiter than standard, but no comparsion to the LED's, the other problem with the Golf headlight is there is know diffuser covering the sidelight so you can see the 8 SMD in all its aftermarket glory - not a look I am keen on!
LED's fitted in the vRS -
And the Golf -