I think a lot of the decision boils down to how you invest. Are you an aggressive investor and enjoy spending time researching? If that is the case, you probably don't want your money tied up. I'm not an aggressive investor, but I am still on the fence. The extra cash has always been nice at the end of the year. But not paying the tax and dues may be enough of a benefit.

So the pilot gets no say in how this MBCBP money is invested, is that correct? It's all in the same fund? But we guaranteed it will never get less than what we put in.

I have to see about the withdraws. At age 59.5 you can withdrawal it, I am guessing at whatever your tax rate is. That isn't going to make much sense for most people here unless you are looking to retire early.