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Fine with a good trend;
but a mini trend or flat trend , CASH+ETFs, like SPY or VOO,qqq =better.
DEC 8, 2015,IBD old Newspaper;
SPY+1.4% YTD + dividends\SPXL {-0.45 negative]Of course they are designed for daily-short term, as noted by js78 here}
SPXS{ -20%negative YTD }
TQQQ+26%, same...