That's just comparing individual chips though. Comparing the more important ratio, hashes per dollar:
BitFury 400G: 400GH/s for $8000 = 50.0 MH/s per dollar (Rasp Pi included in price)
Drillbit Board: 16GH/s for $300 = 53.3 MH/s per dollar (plus the cost of the host computer)
So not that different really. Plus you don't have to fork out a whopping $8k straight away. The power efficiency of the 400GH/s rig is also a bit lower than the Drillbit boards, moreso when you compare using the more power efficient stock 2GH/s rating of the Bitfury chips, rather than 2.7GH/s.
It is great, the value in MH/s per $. The problem we will all be facing is the difficulty level. 3 of the best/deepest predictions are looking at a December difficulty of 200 million, some as high as 500 million.
If you consider the compounding of the difficulty, the ONLY way to break even is if the price goes higher.
http://www.coinish.com/calc/#I do think the price is going higher, very much so by the charts and buy sizes the last month or so. (Large players are moving in - big buys.)
I'm looking hard at the Drillbit system. Lot of bang for the buck.