Anyway they are a lot less than 2x the cost of Gridseeds unless maybe you are overclocking the Gridseed to 500 KHS
I know we had our disagreement in the other thread, so I'm not going to go there. For anyone interested: Gridseed prices have dropped significantly and you can get the "blade" for $1500 (~0.60-0.65 BTC per MH/s at this time). The "cupcakes" are about $120 these days (~0.8 BTC per MH/s). Don't overpay if you are looking to buy.
The blade miner seems like a much better deal than the cupcakes. I wasn't aware of Gridseed blade miner and that one is about 1/2 the cost of KHS at script.cc. However I still expect the value of KHS at scrypt.cc to hold up better as the current scrypt ASIC miners are going to get trapped with just a few coins with increasing difficulty much like bitcoin. Still if I wasn't living in Japan with absurd power costs I would consider the Gridseed blade as it seems buying one now should be profitable.
BTW this thread is a great comparison and a good topic! I also fully expect the rankings to change all the time. That just is how this games goes. The one advantage that having your own hardware is that you can point it where you want.