Antminer S7 Miner 4.73 TH/s

I have the opportunity to buy this Asik http://goo.gl/AQzsAQ. Do you think it's worth it or not?

S7 Specifications:

1. Hash Rate: 4.73 TH/s ±5% ( used )
2. Power Consumption: 1293 W +10% (at the wall, with AC/DC 93% efficiency, 25C ambient temp)
3. Power Efficiency: 0.25 J/GH (at the wall, with AC/DC 93% efficiency, 25°C ambient temp)
4. Rated Voltage: 12V+5%, should not be less than 12.0V
5. Chip quantity per unit: 135 x BM1385
6. Dimensions: 301mm(L)123mm(W)155mm(H)
7. Cooling: 2 x 12038 fan
8. Operating Temperature: 0 °C to 40 °C
9. Network Connection: Ethernet

Shipping list:

Antminer S7 Miner 4.73 TH/s ±5% (used two fan ) X 1 piece

BITMAIN ANTMINER S7: with BM1385 chip

Bitmain is pleased to introduce our latest machine, the Antminer S7. This powerful machine features a small form factor, like our previous Antminer S5, while utilizing the denser hash board arrangement of the more recent S5+. This is the first Bitmain product to use our recently announced BM1385 chip, which is not only more than twice as power efficient as the BM1384 chip before it, but is also the most power efficient chip available to consumers today.
The Antminer S7 has a more dense configuration than previous Antminer machines, using 135 chips in the same space that the S5 used only 60 in. The S7 uses just 1293 watts of electricity to deliver a whopping 4.73 terahashes per second of pure mining power.
Batch one scheduled shipping date is in late September of 21~30. If shipping out 10 days later than the scheduled one, it won't be considered as delay.