All right, I just took the first of the three exams and got 46-50 range. Questions are similar to those on GmatPrep but maybe for a click harder. Definitly take the test timed, otherwise what's the point?
The problem is that I have done GMATprep 20+ times and, although I am constantly getting new questions that are on Q50 level, I am not sure about my actual performance because of the repeated questions that I am already familiar with. So, new software was the only way to somehow gauge my performance.
Is it worth $65? I don't know and I don't care. I already spent couple of hundreds (maybe even 1k) on preparations and I spent $250 on exam, so couple of bucks here and there won't make any difference.