Halong Mining claims that the DragonMint is "the worlds [sic] most efficient Bitcoin miner, operating at 16TH with AsicBoost technology inside for greater power efficiency...."

I decided to do the math and concluded that Halong Mining's claim is true as it relates to power efficiency. The DragonMint is 3.47% more power efficient than the AntMiner S9.  

The DragonMint T1 consumes 1480 watts and achieves 16 Th/s.
16 / 1480 = 0.010810811

The AntMiner S9 consumes 1340 watts and achieves 14 Th/s.
14 / 1340 = 0.010447761

The difference in Th/watt efficiency is calculated as:
0.010810811 - 0.010447761 = 0.00036305

The percent increase in improved performance (measured in terms of Th/watt) from that of the S9 to the T1 is calculated as:
0.00036305 / 0.010447761 = 0.034749035  
0.034749035 / 100 = 3.47%

However, let's compare prices. Right now, you'll pay $980 more for a DragonMint T1 over the cost of an AntMiner S9. That's a 53% premium over the cost of an S9.

Current price for the AntMiner S9 (including PSU) is $1864.00.

Current price for the DragonMint T1 (including PSU) is $2844.00.

Is a 3.47% increase in hashing power efficiency justified by paying a 53% higher price over the S9? How efficient is that? You decide.