The Delkin Black 325GB card is my go to card when shooting my Z8. I only shoot stills, so size of card is no problem. I have not had any problems so far.
I know this card is supposed to run cool, but I had an interesting event happen last week. I was shooting in 83F-84F weather for a few hours. Shooting short bursts of 20fps Raw lossless compressed to only the Delkin Black card with no card in slot 2, with a fair amount of time between bursts.
I got a hot card warning, which is the first time I have had this happen. I immediately turned the camera off, and pulled the card. The weird thing is that the card was not hot to the touch, it was at most very mildly warm. Now, the camera and lens (180-600) were both fairly warm to the touch, but I did not get a hot camera warning, I got a hot card warning.
Despite the hot card warning, I would still use the Delkin Black.