Here is a quick video overview of the Aerous VX3:    

The JH13 Pro was my first purchase of high-end personal audio equipment so it's difficult for me to provide a fair comparison (prior to purchasing them, I was listening to iPhone earbuds), but I can safely say that I couldn't possibly be happier with my purchase.     The process of getting the impressions made was painless (albeit a bit expensive in the San Francisco Bay Area), and about a week after I had the impressions made, my JH13s were waiting in the mailbox.  The fit is excellent (as you would hope in a custom IEM), and the sound...