I read from the beginning of the chapter and it reminds me how little I know of Homer. But I can see that perhaps the drug in that case must be evaluated in full as one of forgetfulness of past events that bring sorrow in remembering them, and from that perspective I think it is a very difficult and hazardous question as to whether forgetfulness of things past would be a wise choice for present or future happiness.
Possibly this points up the hazard of the unmentioned details that are inherent in all pleasure-machine hypotheticals. We are human and through experiments in which we are essentially not human are not likely to be productive.
That's my first impression.