I’ve studied it at my university for about a year. I know some differences in pronounciation and vocabulary between the dialects, but I don’t think I could communicate in them.
Here's a book I think you will totally enjoy! I stumbled upon it last year and could not put it down.
Journey Back to Eden - My Life and Times Among the Desert Fathers.
The author, Mark Gruber, is a Benedictine monk who decided to write his thesis on the Coptic monasteries in Egypt. Though fluent in Arabic, he was challenged to understand the various dialects in the different parts of Egypt. It is a fabulous book and I envy the person who will read it for the first time.