I have to add a little commentary here. I first went with Yellows because at the time I got them at a price point that I couldn't say no. I had been autocrossing on stock struts for a while and thought for sure this had to be better. Also, being on forums like this and hearing the "rave" reviews of how these are the go to fix for S197 handling, I thought how could I go wrong.
My initial thoughts of them at my first event was only marginal. Obviously better rebound then the OEM crap but I had to play with adjustments for a while before I got something that "worked" for me.
I ran them for 4-5 months, 2-3 autocross a month, was fairly competitive in my region, but in the back of my mind I knew I needed to move off of this suspension for the long run. So I made the plan to take them off the car after my last event and move them down the road.
Also coinciding with all this the car developed a bunch of noise: bumps, pops, etc. Had guys at Vorshlag ride with me, help me isolate where the noise was coming from. I put the car up on the lifts about 3 times, checked and rechecked all the suspension to make sure everything was tight. The time came to take the yellows off the car, and much to my dismay found that one front, and one rear was toast. 4-5 months. I put the stocks back on. No pops, no noise.
I caught a lot of crap from people on other forums/FB talking bad about the almighty Koni but this was my experience. And answering phone calls all day about suspensions, I'm not the only one.
I always operate under the premise of buy the right part, even if its more expensive, the first time VS the wrong parts multiple times. I didn't follow my own advise and now I've got some shiny yellow parts for garage art. awesome.
I do work at Vorshlag, its no secret what we sell. I'm not going to tell anyone what they should or shouldn't buy, but if you are racing or want a suspension that can withstand "spirited" driving you honestly get what you pay for. Most coilovers on the market are good for getting your car low and look good which doesn't cost much, only a select few are truly performance minded.