I saw a return of capital investment several weeks ago by luck.  Paid for a unit with LTC when it was over 160USD a coin; about 11.5LTC all in.  LTC dropped like a rock to 60USD while waiting for the pre-order.  I figure the best way to judge a return on capital is to auto-exchange the output for the coin spent.  The one little Mini has been averaging .25LTC a day on MiningPoolHub using 330watts (OCed to 15,500 sol/s).  Has generated about 18LTC to date.  I'm still short as of USD but I'd be hurting anyway if I just held (HEDL?) the LTC.  Now I have a profit, coin-for-coin.

.25LTC a day on 330watts?  Eat your heart out, L3++.  Almost like buying Biakal Minis before the Dash price explosion of early 2017.