The app is good and many courses offered are good too.The android app is very poor and loads forever. Even the website doesn't open while the other similar apps work flawlessly. I don't know why but Udemy web and app experience has always been slow and poor and takes too much data too. If I can't learn seamlessly across different range of devices then why am I even paying for courses that seem to load forrever and gives an error message even though my internet connection is perfectly fine.