Lectures are extremely interesting and engaging. He clearly cares a huge amount about the course and students. He puts in a lot of effort preparing each lecture and his feedback following work is very fast and informative.
Some could find him intimidating but I think this just makes students more focused.
Alex is a truly inspiring lecturer. He knows his stuff, creates very engaging lectures with good examples and really cares for the students.
I wish I've had more courses with him!