I love them!
i got my jalapenos upgraded to 7.5 GH each, received them a few months ago and have made triple my BTC back already!
the electricity use is so low that i expect to continue running them for a long time, especially if the price of BTC keeps going up the way it has recently.

I've also got an early preorder of the knc jupiter.  Just like i had a very early BTC order, i expect that being early to the game will help alot.

I do feel bad for folks that bought later and still havent gotten their gear, but they need to understand that they had a years of pre-orders ahead of them, and pre-ordering gear while making calculations about what the return should be is extremely risky. If i lose money on my next pre-order, its MY fault, not theirs.  I am both a beekeeper and I also keep chickens, and we never count our chickens before they hatch, nor sell our honey before it's bottled. This works the same way.