These things are WAY over priced. $1100 $795. 3 S3s will give you similar hash rate and just slightly less efficient W/Ghs wise at just above half the price. Its a no brainer. And of course there is also the C1 which isn't as efficient but the price is right.
^FTFY. if you think $795 for 1.7TH/s is 'WAY overpriced' you should really find another hobby

the equation is this;
Your belief in Bitcoin vs price of hardware vs your electricity costs.
nowhere in this equation is the efficacy of the miner, as you fail to mention the efficacy of the miner in your own statement.
you're welcome.

Its overpriced, 1 TH/s market price is less then 1 BTC right now...
Can you show the less then 1 btc?
I'm curious to see it's efficiency on electricity.
the prisma mostly, but i think thats pre-shipping.
benefits of the SP20 over S3+ units:
-fewer machines to configure (1.7TH/unit vs 0.5TH/unit)
-Spondoolies allows software undervolting for efficiency in 3-6 months from now or as needed
-smaller size
disadvantage:
-slightly higher BTC/TH price (shipping is cheaper though due to smaller size/weight)
-NOISY. 212cfm-capable fan means a lot of fan noise coming from this box