I've been testing the new avalon nano 3s for the past several days mining to my own solo pool connected to my node. I think it's a solid micro-miner for experimentation. It consistently exceeds the claimed 6 TH/s per device, often reaching over 7 TH/s which is quite impressive running on about 130 watts of power consumption. I haven't encountered any heating issues or any other hardware problems. The overall build quality is excellent. That said, don’t buy this expecting to hit a block, it's strictly for experimentation unless you consider yourself one of the luckiest people on earth.