The way this service works is certainly well-focused, as developers simply submit their precise test requirements and the prize they are ready to give to the ones who provide the best feedback. Testers who are interested (and who have the necessary knowledge, obviously) can sign in for that specific test run, and begin competing for the prize that is offered.
A service such as this one is innately good in the sense that it can let developers come up with higher quality products in a much shorter span of time, and having them reach their intended public much faster.
Registration to the site is fast and simple both for testers, and for the companies that want to have their applications tested in such a crowd-sourced way.
99Tests.com In Their Own Words
Meet the bugs.
Why 99Tests.com It Might Be A Killer
It is a great way for developers to have their applications tested by experts the world over.