The new ones are a good improvement over any of the past drivers I've used, to the tune of about... I might have to find out how much better.
Edit: I did some calculating and figuring out how much of a difference it made, let me show you the numbers.
Oldest drivers used were the 15.11 set from Dec. 2015 and they averaged me 269,896ppd This was figured over 300 WUs on 3 290Xs and 1 390X.
the next set of drivers I used I didn't have a large enough pool of WUs to calculate, so I went to the last set of drivers I used prior to the most recent which were 16.9.2, I tried the 16.11 but reverted back cause they were WHQL signed so none of my futuremark runs came back valid, but the results were 261,263ppd over 169 WUs, not a good showing.
These newer drivers really impressed me tbh, and it's not a large pool of data but it is impressive for 16.12 for a 304,239ppd, that's a nice bump in production, and that was taken from 119 WUs.
Needless to say that these new driver are well worth it so far, hope that answers your question in the most long and drawn out way possible.
wow I really dragged that one out.