The site is of course, relatively new but it is indeed very nice in my humble opinion, and after some hours of what I'd call fun (but also a bit of hard work), I had found a vulnerability which entitled me to 75€
(The payment for each vulnerability found, and the maximum amount of paid vulnerabilities, depends on the pentest.)
Do you know any similar projects? I'm not talking about exploit research and development as you can do "for" ZDI, and similar sites.
Anyway, check out http://hatforce.com if you're a pentester or a company looking for this type of pentest. There's currently a free start promotion going on until the 31st October too!
This site is definitely worth 5 minutes of your time, as it was for me last week when I decided to check it out.