This ETF is one of several options for investors looking to access the U.S. financial sector, a corner of the domestic equity market that generally exhibits significant volatility. As a sector-specific ETF, IYF is most appropriate for those looking to implement a tactical tilt or carry out a sector rotation strategy, and probably has little use for those building a long-term, buy-and-hold portfolio. This fund is heavily skewed towards large caps, but does also include some mid and small cap allocations as well. And IYF offers considerably deeper exposure than the ultra-popular XLF; this iShares ETF has more than 200 individual holdings, though a few big names account for a big chunk of the total portfolio. The biggest drawback of IYF is the fees; it is much more expensive than both XLE and FFL, which deliver generally similar exposure to U.S. financials. This ETF can be a useful tactical tool, but there are more cost efficient options available.