Managed payout funds, like target retirement funds, are really nothing but gimmicks. You have a collection of other mutual funds bundled by a certain set of criteria. This isn't any different than creating a couch potato portfolio and adjusting fixed income based on risk and timing. The managed payout funds simply simulate a safe withdrawl rate the buyer feels comfortable.
Next month when the market begins a major bull rally sending it up 45% by the end of the year (yeah, right) the withdrawl rate of the managed payout fund might look pretty puny.
I hate to say it; but if the goal is to simulate a SPIA, buy an SPIA.