HID Headlights and Fog Light Questions (point me in the right direction)

I know there is a search feature, and I've tried but there are oh so many threads concerning these subjects some going back quite a number of years and some having little to no replies so I figured I'd ask here.
Hopefully someone can point me in the right direction or will have an answer for me.

First; the Xenonsupply HID kit, yay or nay? From what I've seen around here there are quite a few review threads and people seem to like them.
And if they are good - do I need to order the Relay Wiring Harness? It's listed as optional but I don't know the first thing about this stuff and I know you've all had various experiences with such things.

Secondly; I'm looking to install yellow fog lights on my 2011.
I know there are a number of "yellow fog light kits" like the Spyder FL-TPRI2010-Y. Are these any good?
I know with an $80 fog kit you get what you pay for... but would it be worth it?
Or is there a better way? I know some people mentioned buying the kit from the PC shop and installing yellow LEDs or applying a yellow film? Is it just different strokes for different folks or is there a correct way to go about doing this?

Sorry if these questions have been asked to death.
Hope someone can help!
Thanks in advance.

 

Cheers.
I was reading through your thread a bit earlier.
The relay is only like an additional $20 from xenon supply so it's not a huge deal. Just didn't wanna spend money I didn't need to.

So does anyone know anything about the spyder fogs then or no?