Well it is all about temperatures. I went from 384M to 387M -- noticed no temperature increase and my hash rate increased by about 4Mh/s on average.
I have really cold AC on the unit -- Output temperatures are no hotter than 59 degrees C on "Temp(Chip)."
Didn't notice an increase in HW errors -- although Chain #3 (5 HW) and #4 (22 HW) have always shown some over a 24 hour period. Another person had similar findings in another post.
The unit is quite impressive and the fan can get pretty quiet if the airflow and temperature is right.
I "rent" it on Nicehash when the price is at a certain level -- otherwise it defaults to a select alt coin pool where I mine a variety of alt coins. lol
Nicehash is the best option if you want to get paid in btc... What pool are you using to mine the alt coins and what PSU are you using for L3+?