In my opinion, cobalt is completely another class of products. Plastic vs anodize aluminum(however, cobalt noticeable bigger so the weight could be comparable), 20 times difference in power, 100 times difference in distortions, 4 times lower PCM Fs(96 vs 384kHz), $300 vs $85. After all these differences the idle current consumption 70 vs 88mA doesn't look impressive, isn't it?
For everyone who itching to buy DF cobalt I honestly recommend taking a look at Meizu HiFi DAC. 5 times smaller aluminum case, 2-3 times less idle current consumption, the same or higher output power, 10-20 times fewer distortions, 3 times less noise = higher dynamic range, 32/384 +DSD, $19 vs $300 price.