Certainly done okay for me. Since 2013 I have put in $85K, withdrawn $87K, and present balance is $73K.
With -$2K of original money in there, $73K balance is fine by me. Plus there were regular dividends with one of the funds on top of that.
My average is listed as 15.65%, Can't be bothered trying to work it out as my investments were not made all at once and same with withdrawals.
All the funds I'm in hold a huge proportion of cash at present, so not too worried if there is a bit of a downturn in the respective markets, as that will create further opportunities.