This ETF offers exposure to mid cap stocks that exhibit growth characteristics, making IWP 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 IWP and its value counterpart IWS, the result of a methodology that uses a generous definition of growth stocks. Rydex offers a 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 and IVOG seek to replicate the same index at comparable expense ratios. VOT is slightly cheaper, and may be available commission free in certain accounts, while IWP will generally feature narrow spreads. IWP is a fine ETF, but there are a number of alternatives out there that offer more compelling methodologies, lower fees, or potentially better execution.