Bob, I too have found the same thing as I researched these ETFs.
I have spent a lot of time making time comparisons and the conclusion I reached is that it is all time dependent. In some of the time periods being researched they behaved almost perfectly as expected. In other time periods a person would get about the same results as the author of that article.
It is my opinion that one should use the StockCharts PerfCharts bar charts tool and compare the results for different time periods and 'length' of time periods before coming to a conclusion about whether these ETFs are performing as advertised.
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