E's system is quite good, but F-list has several advantages over it:
- The list of kinks is more comprehensive.
- The pop-up descriptions are more detailed (and easier to use)
- Custom kinks and descriptions can be added
I also find it inconvenient that the character/gender preferences is strongly tied to dom/sub preferences, especially since the categories are very broad and ill-defined.
For example, both a preference for the partner to take the initiative and a desire to be treated like a slave can arguably be categorized as "submissive", despite being quite different. I would love to see better granularity or more axes (plural of axis).