Hi, and thank you for the compliment. I have been sewing a long time, but still, wouldn't consider myself advanced!!
I would say if you are happy and confident with making a shirt from a regular pattern and instructions, then this class is great. I really loved it.
It is more about how to change the details to make any pattern your own, rather than how to sew a shirt from start to finish.
I found all the new information in this class, very easy to follow and well explained.
Good luck and I hope you enjoy it as much as I did.