Welcome to .com bubble v2.0<p>The only things I ever used (and heard of) for used cars that look legit are mobile.de and autoscout24.de. Auto1? This sounds very new - they're not known in Germany or Poland (disclaimer: I'm Polish working in Germany).<p>Edit: looking a bit more into their website - they do B2B auto1.com and B2C autohero.com. Why everyone insist on calling a simple company a "start-up"? It's just normal company, nothing interesting there ;)