Hehe, this sites exists since, well, a loooong time. I typically use it as a directory, to know whats available in a certain category. But I really wonder how this site made it onto the frontpage. This is a bit like posting "amazon.com" :-)
I guess it's popular because people outside of Germany didn't know there is a better product search than amazon.com. And if we honestly compare the two, Geizhals beats Amazon in almost every regard, from better filters to less tracking...
Pretty much anything is better than Amazon's search.
Well, I am "outside of Germany" and I know the site since at least 15 years. May I remind you that europe consists of more countries then just Germany?
Got downflamed for stating this below so you have my + ;)