If qqq is good then the tripple q's should be almost 3 times as good if you can stomach the drawdowns.
So, if you put $100 in TQQQ and kept your account 100% invested in it at all times, you would end up with $216.82, versus $182.10 for the QQQ. But while the QQQs max drawdown was 28.56%, it was 69.92% for the TQQQ.
HOWEVER, to make it apples to apples, if you drop the amount of TQQQ invested from 100% of your account to 39.7% (again, at all times), your $100 grows to the same $182.10 of the QQQs, and your max drawdown was 33.53%.
SO, not really that bad, as long as you keep the % of your account invested in them somewhat low to avoid those HUGE drawdowns.
For what its worth, I ran the same thing with SQQQ, the inverse of TQQQ, but shorting it instead. The results actually came out slightly BETTER THAN the QQQ. But that is ignoring the interest you have to pay on the short, as well as the fact that if you are short it might get called out from under you at any time, forcing you to pay taxes.
To me QQQ still reigns supreme, just buy it over time, never sell, and let the profits roll.
EDIT: XLK seems to be the new leader per the posts that follow!!!