Has anyone taken the 1C-Bitrix Programmer course from skillbox?

Question

IT education

I'm interested in a real review about this course, now I'm thinking whether it's worth taking it or studying it on my own.
How good are the materials?
Are the teachers competent, do they sensibly check the tasks and how quickly, otherwise I heard that I was dragging them out a lot.
The goal is to quickly master Bitrix, find out typical solutions on it, pitfalls ...
In general, any information is of interest, including other courses on this topic.
Thanks in advance!