Been running this driver for last 4 days.  Works like a charm.

1- At time of driver change,  had an extra 7% average boost on hashing speed.   Didn't have any change in power consumption like some are claiming (tested at the wall).

2- I'm almost entirely working with RX580 and some 570.  So I can't claim it works well for the 4xx series.

3- Last DAG epoch did NOT change anything on hashing speed.

Overall I'm really glad this fix has been provided here. 7% gain is huge not to mention it would have been worst on each epoch.  Unless a new official AMD driver is released and provide another increase in overall MH, I will probably stay with those for a while.