So, it looks like, if you use the 4% withdrawal rate and you use their default assumptions, they predict about a 95% chance, over a 30 year period at least, that you'll not run out of money.
Using my general mix of types of securities, and assuming my pension and SS are still around, and giving myself quite the pay raise in retirement rather than just making up the deficit on expenses after pension and SS, I'd be increasing my net worth every year in retirement, even if I don't add hardly anything more until I'm 65. And that was the lowest line.
That is a nice feeling.