Once you've driven a car with Bi-Xenon, you won't look back. Your eyes will thank you during those late long drives, the high intensity is a blessing for tired eyes. Fog light will not compare to a Bi Xenon light. I rarely switch on my fog light as there's no need for extra lighting. BiX on the Tig also includes swiveling and cornering light (secondary bulb) which is fantastic when taking a corner.
Just a note, the bix system on Tiguan does not include secondary high beam, so if you need to flash someone during the day, the xenon will light up, not recomended as frequent on off cycle will shorten the bulb's life considerably.
Under normal circumstances, the life span of the bulb should equal the car itself. No Idea with the pricing of replacement bulbs, you can do a search for D2S (I think) bulbs.
To think about it, it's one of the best safety feature a car can have.
For me, the look itself is worth it:
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