This booming ETF has produced impressive results for investors in the past five years.The S&P 500 deservedly gets a lot of attention from the investment community, as it includes 500 of the largest and most profitable companies based in the U.S. But it's the Invesco QQQ Trust (QQQ -0.56%) that has performed significantly better for investors.This exchange-traded fund (ETF) needs to be on your radar, particularly if you're trying to supercharge your investment returns. Is the Invesco QQQ Trust a millionaire- ...