Hi citronick! Haven't got S7 yet. When I've seen how they made heatsinks for it I was repelled from buying it. Chips at the back of the miner will always be very hot and will depend only on air, instead of termal conduction of a large heatsink. Meaning that they will overheat easily and thermal adhesives tend to lose their grip on higher temps. Which can end in heatsink unsticking from the chip.

If I ever get S7, that will mean I'll try to get all heatsinks off and get my own heatsink design extruded.