I have done 2 thus far through FinQuiz, and I am very glad that I did them considering I did none last year and I failed. Overall, I feel that if you come with the perspective that they are just practice, they are very beneficial. Sure, there are some errors and there is a slight language barrier, but they(FinQuiz) know their stuff and I feel that their questions are intended for you to grasp the concept, not necessarily an accurate portrayal of what you will see on exam day. I plan on doing another this weekend.