I tried DAZ some time ago, Iray was going strong while Poser didn't yet implemented the Blender's Cycles. I gave up quickly when setting up a scene with 6 or 7 characters. They simply wouldn't fit the RAM of the card (a decent gamer card back then) and it would use the hobbled CPU rendering at a tortoise speed. Since my kink is geared toward scenes with dozens of characters or more, that limitation annoyed me greatly. This constant management of resources, concerns every time you add another prop, maybe it's too large, what else to remove to keep it in the RAM, I found it a stiffle to creativity.
Then Cycles came around in P11, proved to be an Iray on steroids and never looked back.