The amount of other things you'd have to add to make Immortality/invincibility/invulnerability ETC. with no ability for me to turn it off appealing make it such a different question there's no point in me answering.

So, no. I will not take Immortality with no off-switch, even if it means I can never be harmed again, never have to eat or drink again, could exist without issue in the vacuum of space, ETC.