Thoughts on Fidelity's new Zero funds

[dnmccoy]

Im looking at the newish Fidelity Zero index funds that have %0 Fees. Other than them being new, is there any downside to moving from FXAIX to the zero fee fund?

[RWD]

Previous discussions:
https://forum.mrmoneymustache.com/investor-alley/transition-to-fidelity-zero-international-fund-in-order-to-tax-loss-harvest/
https://forum.mrmoneymustache.com/investor-alley/zero-fee-index-funds-at-fidelity/
https://forum.mrmoneymustache.com/investor-alley/fidelity-zero-fee-index-funds/
https://forum.mrmoneymustache.com/welcome-to-the-forum/fidelity-zero-expense-ratio-index-funds-and-no-fee-stocks/