It's an extra 6 months or so, and it's almost certain a better solution won't be come available in that 6 months, and even if it did you are very close to death and unlikely to recover even if a miracle cure is developed. In the meantime you are in intense pain and suffering wild side effects.
The abstract of the article claims that the median value of extra life time was between 8 months and 9 months.
Therefore those well above the median might have reached an extra year of life.
I agree however that because almost all of them (96%) had severe side effects, many people would prefer to not choose this kind of life extension.
My own parents were such people.