Depends, everyone approaches their finances differently and have different tolerance for risk. I would base my decision on how close to retirment I am, what I can afford, how long I can support myself without some type of assistance.

My company offers LTD for up to 60% of my salary, I bought outside LTD supplement to make it 100% of my salary. I did this so that if I end up on LTD I will still be able to save for retirement as most LTD plans end at retirement age. As I get close to retirement I will probably drop the supplement and then later drop the LTD all together and if affordable/qualify try to pick up some type of post retirement care insurance.