I think HID retrofits are better value than Vkool VK tints. Honestly I'm not all that impressed with my VK70 - my K14 was still better and that was 1/2 the cost. The VK70 offers the same heat rejection as OEM05/20 which is much much cheaper. Only advantage for me is that it's clear and thus looks cleaner and has better visibility at night.

Osram Nightbreakers work pretty well at night - never had any problem seeing during hard rains when I had them on my car before. For the layman though, it doesn't look any different than the normal halogen bulbs. What I like about retrofits or HID in general is that it really stands out at night.