Experience with supersport suspensions

Servus! Wants to lower my friend’s Lupo. I hit a sports suspension – 60 mm from Supersport on eBay. The price of 200 € for TÜV-tested quality and “Made in Germany” is simply unbeatable in my opinion. Now I wanted to ask you about your experience in terms of workmanship quality, driving characteristics, hardness and rest comfort. In short, would you recommend the suspension?