Lifetime subs get you an account-wide unlock of an Android boff per captain, your choice of tac / sci / eng and male or female. They have self-rez and Superior Kit Performance so they're a nice choice for away teams. They're also dismissible and reclaimable.
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Will having a space kitty make your life more complete? Buy one.
Do you really like Borg, more than Aliens and Androids? Buy one.