Ordered a December batch L3+ that was supposed to be shipped Dec 21-29 and guess what.  It showed up yesterday 12/15.  An extra week of hashing.  For those waiting, if you shipped UPS into the US, there may or may not be a "Brokerage" fee for clearing customs.  My power supply did not get one, the miner did ($52.12).  That's 2 days of mining based on what I'm generating the last 20 hours I've had it up and mining.  I'm pretty sure Bitmain premines with these unit as there was a little more dust on it in certain spots than what a 2-3 day burn-in would generate.  So far so good.  One board does generate a few more HW than the other 3 ( 79 in the last 12 hours compared to 12-32 for the other 3 boards).  Running it at 387 frequency with temps between 48-51C.  So far pretty happy, will hope that continues for a while.  Will see what the Diff does as more of these hit the algo over the next few weeks.