Some things which you stated are good, such as you can gain knowledge in every field.
Personally, I wouldn't like to be immortal. Seeing my family and friends die around me would just destroy me. Plus, I think I'd just get bored of life. I find immortality interesting though as some friends would like to be immortal as they can see how things change. However, they all said they'd eventually get bored too. I would only like to be immortal if my friends and family were.