For completeness, how about the other iShares S&P 500 Sector ETFs?
IUFS (UIFS) financial services
IUCD (ICDU) consumer discretionary
IUES (IESU) energy
IUCS (ICSU) consumer staples
IUIS (IISU) industrials
IUMS (IMSU) materials
IUUS (IUSU) utilities
IUHC (already on T212) (IHCU, not on T212) healthcare
These are all priced in $, but there also exist versions of these in £ such as UIFS, shown in parenthesis above.
These can be useful for rebalancing when one to increase holding in a sector but is not convinced at present what individual stocks to buy. They all have TEF of 0.15%, a bit higher than the 0.07% that is charged for IUSA.
I am presently investing in IITU.