Thanks for the info.
I started a little late in the game and bought a set of 9 USB ASIC miners with an Anker hub earlier this year..
I managed to sell off the miners at a reasonable cost and buy some AntMiner U1's.  As the cost of those dropped, I bought a couple more, then bought a U2, another 9 port Anker hub (the hubs were cheap enough and I will always have a use for a good USB hub), then ended up buying a couple of batches of U2+.  I've got a new heat sink setup for those almost ready and will resistor mod all the U1 and the one U2, and measure the resistors on the U2+ to see what values they're running.

I've put heat sinks on every chip of the S1, as well as the voltage regulators.  I'm doing the same with the USB sticks as well.
With the heat sinks, enclosure I built, and secondary fan, I've got it overclocked to 393.75 and it runs with 0.8% HW error or less and the temps, even in the summer heat, hit about 48C and it just keeps chugging along.  In the first month it's probably had a 50% ROI.

The thing is, each time I have enough Bitcoin, I turn around and convert it to dollars to pay some of my credit card bill (not because of the miners, just need the cash to pay it) so I'm not hanging on to BTC long enough but at the price I'm getting, with BTC ~ $450-$470 USD, the extra couple of hundred that has gone to the credit card makes a big difference.