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Are there any consequences for investing in Vanguard's Admiral Shares funds instead of ETF's in a Roth IRA?
ETFs purchases are subject to a bid/ask spread, which is the difference between the highest available purchase offer ("bid") and the lowest available sell offer ("ask"). You can read more about this concept here. This cost doesn't exist for mutual funds, which are priced once  per day, and buyers and sellers all use the same price for transactions that day. ETFs allow you to trade any time that the market is open. If you're investing for the long term (which means you're not trying to time your buy/sell orders to a particular time of day), and the pricing is otherwise equal between the ETF and the mutual fund (which they are in the case of Vanguard's ETFs and Admiral Shares mutual funds), I would go with the mutual fund because it eliminates any cost associated with bid/ask spread.