You can't compare the wattage on a BFL with an Avalon. An Avalon is a self-contained mining device. Add in the wattage for the laptop and the BFL is less efficient than an Avalon! ROFLMAO.
You are probably wrong in a couple of asumptions. For starters you can use something smaller than a laptop, eg. a Raspberry Pi. Secondly you only need the one to talk to the 5GHs, 25GHs, or 50Ghs products, at the high end power consumption the controlling computer becomes insignificant.
That's not what the demo showed, now was it? They showed the power draw minus the computer, which is not a fair comparison to a complete Avalon.
The "Tethered wattage" problem...
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I am sure the demo guy can just turn off the laptop and save a few watts in the calculation....er...wait....
5.3 GH/s @ 36 watts + 20 watts for laptop = 10.6 watts/ghps
68 GH/s @ 620 watts = 9.1 watts/ghps
Efficiency: Avalon
5.3 GH/s @ $149 = $28/ghps
68 GH/s @ $1500 = $22/ghps
Price: Avalon
June 2012 -> May+++ 2013 = 11+++ months
Sep 2012 -> Apr 2013 = 7 months
Time to market: Avalon
Triple crown goes to: Avalon!
68 GH/s @ 620 watts = 9.1 watts/ghps
Efficiency: Avalon
5.3 GH/s @ $149 = $28/ghps
68 GH/s @ $1500 = $22/ghps
Price: Avalon
June 2012 -> May+++ 2013 = 11+++ months
Sep 2012 -> Apr 2013 = 7 months
Time to market: Avalon
Triple crown goes to: Avalon!
5.3 GH/s @ $149 = $28/ghps
It actually costs $274.
Triple crown goes to: Avalon!
Avalon > BFL perhaps, but BFL is in my budget and Avalon isn't even close.
