The Gridseed ASICs that can mine scrypt have been on the market for a few months already
The ASICs I was talking about are those which really CAN obliterate scrypt mining. Gridseed is in no way to do that. Just compare price to speed.
what is promised is minimum 250MHs for 15000 EUR
Counting a little we get almost a tale in performance to money - after <2 months for returning the full price start to make 20-24K USD a month.
I am not interested in Gridseeds, so I can't tell the price for a fully working unit. The web page you offered sells all the parts in separate. But price for a unit 4200$ for 8 MHs maximum is in no comparance. May be I am mistaking here and those units work much faster? But from what I see the bonus here is only size and power consumption which is rather low in comparison with GPU rigs of the same mining compability.
Read your own post again... Your post is referring to all Scrypt ASICs as it was written.
If you meant otherwise, then be more specific.
The Gridseeds are only the first generation and their main strength is in power savings. Others like KNC with their upgraded spec of 250MHs for the same price they were going to charge for 100MHs is definitely where the heat is going to come from in a few months.