It really, really depends. I will never belive that life extension options are a bad thing: The ability to live as long as you want, and pass gracefully when you are tired, would be a blessing beyond any that we have been given since the ability to look at our reflection and see ourselves with bright eyes.
On the other hand, FORCED endurance would inevitably turn into "I have no mouth and I must scream". At the very least, you'd be stuck floating in the void, praying that Protons eventually decay and that your mind turns off.
That second one seems impossible in OUR universe, thankfully: Once physical form is destroyed, the mind seems to go with it as far as we know. So there's no reason NOT to pursue longer and longer lives, as long as we can fill them with meaning!