The medical side to things is definitely a huge step up. On a personal side, I think it would be cool to be able to actually witness history as it's being made. Sure, we already are, but there's going to be so much more. I'm a big fan of horror, and one discussion I've has more than once with people is "Would you become a vampire if given the chance?" And while the whole drinking blood thing is a turn off, there is the idea of getting to see humanity evolve. If anything, I almost would rather have had that option earlier. Getting to see everything from the mid 1800s to now would be perfect. But they say there's no better time than the present, so I guess if given the chance, I would actually consider going the immortal route to see everything.
But the whole financial factor is also the big thing that makes me really question if I could support it. We are already seeing how fucked capitalism can be. And since it would likely only be for the rich for awhile, it would mean they can just take even longer to set up a world for them even more than it already is. Eventually they might start to offer it to us, but it would be more so for working purposes. Line Bezos will provide it to people for free... as long as they work for him. But once they quit, they no longer have it available. So either work 60 hours a week minimum for Amazon, or you don't get to be immortal.