Tuomas Rasimus has just published a book review on Dylan Burns, Apocalypse of An Alien God. It is a well-written piece meant for the general public, so it is very accessible and gives a current state of affairs in terms of scholars' thinking about Gnosticism.
I agree with Burns and Rasimus, that the Gnostic impulse reflects revelatory traditions frequently found in Jewish and Christian apocalyptic thought, although I don't confine this impulse to Sethian literature. While Sethians were Gnostics, not all Gnostics were Sethians.
Here is the link to the book review published in Marginalia, Los Angeles Review of Books.