There is very interesting news about the Avalon 7 
Here is quote wrote by cgminer developer Kano in his pool thread:
Hi Kano - can you run the latest S9/BDR stats, if any... just to be sure... I have a strange feeling about bmminer 1.0. All of Juvia is still bmminer 1.0 and I have not upgraded to bmminer 2.0. I hate to think that there is something rotten in v1 firmware against Kano pool. Thanks
The stats are only getting better, not worse.
Also the 2.0 has now found a block with a BDR less than 1.0
However, for more interesting news ... there's been an A7 pull request on cgminer
https://github.com/ckolivas/cgminer/pull/701
Here is quote wrote by cgminer developer Kano in his pool thread:
Well those damn S9's are back and there goes the luck!!!!!!!!!!
Hi Kano - can you run the latest S9/BDR stats, if any... just to be sure... I have a strange feeling about bmminer 1.0. All of Juvia is still bmminer 1.0 and I have not upgraded to bmminer 2.0. I hate to think that there is something rotten in v1 firmware against Kano pool. Thanks
Also the 2.0 has now found a block with a BDR less than 1.0
However, for more interesting news ... there's been an A7 pull request on cgminer
https://github.com/ckolivas/cgminer/pull/701