I have 15102018 running at 975mhz stable, 7.1 hash rate on average. Any higher clock speeds than that, the chips start failing.

It'll be interesting to find out what they mean with that email about earnings increasing.

HDAC has been around longer than the Z1's, so perhaps GPU's made up the bulk of the hashing power since it's relatively unknown to the Z1 owners on here? When I mined with my 1080ti Lyra2rev2 wasn't the most profitable algo in 2018 so maybe we will see a redirecting of that hashing power elsewhere. Otherwise it looks like an ROI will be difficult for myself with the Z1 with the Vertcoin fork in Q1 2019.

I've had a few miners and I've personally never seen the hashrate/difficulty double in the space of a couple of hours upon a new miner release or manufacturer testing. The fact that vertpig has gone offline due attacks makes me think it's an attack but I can't find anything official from mona or vert.