There are easily accessible audio files for each for every exercise that I reviewed and it is in clearly enunciated and authentically paced Spanish.
There is no auto-correction of student answers, however the correct answers are available easily from a pull down menu. The pull down menu is a little bit awkward at first .
Extensive list of vocabulary and grammar fit for semesters 1-2 of college-level Spanish but it would not be useful beyond those levels. Although both the subjunctive and the indicative are reviewed through exercises, there is no exercise that I found that addresses the subjunctive vs. indicative.