This ETF offers exposure to mid cap stocks that exhibit growth characteristics, making IVOG a potentially useful tool for investors looking to fine tune their domestic equity exposure or implement a tilt towards a specific investment style. Investors constructing a long-term portfolio would be better off with a fund such as MDY or IJH that includes greater depth of holdings and a mix of various styles. Growth strategies often come with biases towards specific sectors, and may outperform more broadly-based indexes in certain economic environments. It should be noted that there is often considerable overlap between IVOG and its value counterpart IVOV, the result of a methodology that uses a generous definition of growth stocks. Rydex offers s pure style alternative, RFG, that is slightly more expensive but will offer a considerably more targeted focus on growth equities. Those seeking to make a meaningful tilt in their portfolio would be better served by using that fund. It should also be noted that IJK seeks to replicate the same index, though it is slightly more expensive than this fund. IVOG may have further appeal to those able to trade this ETF commission free (it's eligible for commission-free trading in Vanguard accounts).