Greek spoken to fast.
It would help greatly if there was a slower version of the spoken sentences. I am still new to the pronunciation of the Greek letters and an opportunity to hear the sentences slower (like they have in ChineseSkill) would be helpful.
It would also be helpful to be able to click on each individual word to hear it pronounced separately too.
The Greek course has all the features of courses with machine-generated voice: you can replay the speaking, if you are on a listening exercise you can play the slower version, and you can put the cursor on a word to hear how it is pronounced. ;)