There are listening exercises, where you have to type what you hear. But there are no speaking exercises, where you have to repeat what you hear into a microphone. The programmers are not prepared to create software that can evaluate the Klingon sounds it is hearing (though something similar was done for the language lab on the old ST:Klingon game).
Would you recommend to go there if you'd speak klingon quite well or do you think it would be beneficial for people new to the klingon language?
I think that the qepHom is best for beginners or lower intermediate Klingon speakers.
There's always a course for beginners, and while there are activities for more advanced speakers, someone who is fairly fluent may not find themselves challenged enough -- unless they help teaching the less experienced ones or help them practise what they have learned.
The next qepHom in Saarbrücken is from 12-15 November 2020 : http://www.qephom.de/d/nextqephom.html
There's a limited number of seats in the room, but it's a lottery system rather than "first come, first served". People who have never been to a qepHom before have a higher chance of "winning" a seat, I believe.
Do try to go there if you can!