What's great
This is just clean! Very professional and well polished. It's perfect for long hours of coding. My current favorite is Palenight High Contrast. I've played with the highlight color and went back to the original teal color. It's perfect like it is! I love that it just works perfectly for me and I don't have to tweak everything.
What needs improvement
Nothing really.. I'm afraid additional options might make it a worse experience. I like the simplicity and ease of use. Maybe some more variations on font and icon packs perhaps. Maybe some matching terminal (zsh, bash) themes to boot?
vs Alternatives
Price point? Honestly I didn't realize it needed a license. I happened across it when setting up a new IDE and went looking for the material theme. Went for this and was quite impressed! Bought a 6 pack license in the same hour. I don't need 6 licenses, but the price point was right!