I've run it for several days now, the screenshot was just an example. I normally use cpuminer because cgminer crashes after a few hours and disconnects all the Gridseeds, and I have to reboot the Raspberry Pi in order to get them all back.

I should be getting around 28 MH/s for 80 Gridseeds, but my pool only reports 6.5 MH/s. Strangely, one of the Raspberry Pi's has only 8 miners connected to it and each one is submitting shares, unlike the remaining 3 Raspberry Pi's that are hooked up to 24 miners each and only 1-3 Gridseeds per Pi are submitting shares. I'm not sure if it's because of the USB hub or the number of Gridseeds used, but this is the kit from Zoomhash so I'm under the assumption (perhaps erroneously) that everything should work.