what kind of return are you pulling with one of these?  I just ordered a Bitmain Antminer A3, but i heard they might do a hard/soft fork which would render it useless.  Did anyone else order one of these?  I like Siacoin and I think it has a good future, but we will see for sure.  I wonder if it can be used to mine Raiblocks since it mines on the same Blake(2)b algorithm.