It is great, but stick to the static theme generator for specific sites or it can slow them down considerably.
It is very noticeable on duckduckgo:
clicking a result link and then going back to ddg takes seconds longer with dark mode on, which is ridiculous.
The static mode cannot be used globally because often it doesn't work right (most video sites are broken), so the only solution is to manually set the theme mode per page (this can be done easily but the UI to do so is not very clear).
Dynamic mode should not be the default for high profile sites like duckduckgo with such a considerable impact until this is addressed, and the static theme generator should be improved such that it works with most sites.