Just received yesterday some gridseed units from asiabtc everything work well tanks to the great support from him , after a firmware upgrade the units are hashing smooth in LTC mode at 300/350 khs each,i  will try the combo mode in the next hours, i sell few of them for 400$ each or equivalent in  BTC including cables firmware upgrade and help for setting ,buying 5 units i give for free a PSU i'm EU based north Italy locally pickup welcome i prefer to ship inside europe,for any question PM me