I think the consistent share feedback due to vardiff was the biggest attraction of miningpoolhub. Many people mine here exactly because of vardiff (was definitely a large part of why I chose this pool). Like watson2316 said above, it's seamless for a variety of rig hashrates from small single GPUs up to large nicehash rentals.  It is annoying having small workers rarely submit shares but also annoying for large workers to spam shares, and vardiff fixes both ends.

Vardiff seems like one of the most popular things about your ethereum pool. I hope you keep it.  Am not sure exact difficulty before, but was much lower.

Did you change something about Ethereum share difficulty?  I am getting shares very rarely since sometime in the last day. I have many smaller hashrate workers and the lower difficulty was very useful for smaller miners and rigs. Hopefully you can lower this back to original or if server load is an issue at least don't raise it so much? I know the ethereum network is getting very large, but us small miners still have a place here I hope!