Practical questions but have already been answered in the OP:
1. 6 months warranty for the hardware, provided by friedcat. Decision to overclock, mining another coin etc lies with the shareholders, each has veto power.
Just to clarify..
The ASIC blades after batch 2 already comes overclocked. So there is nothing you need to manually.
Just click on a button called HIGH in initial config screen and there you go.. It runs at ~120W on 1.20V (overclock)