I got my miner from KNC only a week late and under speeds listed on website but still much higher than when ordered so I'm not a KNC hater by any means, however the fact is they did state that refunds were available up until your miner shipped.  Like DT said they didn't honor that agreement in the end.  I appreciate what KNC did and yes their performance even if it gets worse will almost certainly be stellar compared to Avalon or BFL however they still left plenty to be desired.