Though I know others feel differently (sometimes vehemently), aside from instrumental considerations (near guaranteed longevity & the welfare of others) I personally don't mind being wireheaded.
My attitude is similar to the one that denisbider expresses here with some qualifications. In particular I don't see the number of beings as so important and his last paragraph strikes me as sort of creepy.
From Mike Darwn's Chronopause, an essay titled "Would You Like Another Plate of This?", discussing people's attitudes to life:
Conclusion, graphs, and references in article. As usual, I recommend reading Chronopause.com as Darwin has many good articles; to quickly link a few: