Many thanks for your input everyone! Michal Orlowski seemed to struggle a bit at the eos in Andernach, but at the end of the day, his and Oliver Speith's cars looked really good. The level of competition has become insane, but for me as an average driver who intends to run a 13.5 most of the time, the box stock kit seems to be a great package. I can't think of any other reasonably priced kit that comes with as many options and is compatible with preglued tyres. I think I am getting lazy in my old days...
Edit: Oh well, I could not help it and bought another YZ-2. Thank you again everyone nonetheless, I really appreciate it!