I'll be flying two return trips a year, with a possible extra trip in the rare case of unforeseeable occurrences.

This will be for at least 4 years. The flights are Heathrow - Hong Kong, 5990 Imperial miles each direction, for a total of a little less than 24000 miles per year. Some short flights within East Asia may also be an option, so it may tip above this number a bit.

Are the benefits I would get from a membership great enough to warrant getting one?