These will easily outperform US (and probably global) equities by a very wide margin! (3%-5% annually) - And so will the 10-year Notes, and the T-Bills, and ... Bet on it! ( Inflation expectations = waiting for the Tooth Fairy)
... and when the head o JP Morgan Chase says; "I wouldn't touch 30- year treasuries!" ... You know it's time to load up!
Some additional aspects and relevant considerations regarding the Yield Curve, the U$D and similar matters;