Author here.
I got the one with Iris Pro. I was a bit worried about performance but after using it for a couple of days I'd say it's more than fine.
I haven't connected it to a 4K display though. I will try that and get back to you.
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Yeah, well, I know that Iris Pro is slow with an external 4K display. Not just 3d, even moving windows around is sluggish.
I was hoping it is still possible to buy a 2015 MBP with a discrete Nvidia GPU in it.
I'm using a Dell P2415Q using the provided mDP to DP cable and it works just fine in 4K at 60Hz.
Maybe you were using it at 30Hz?
No, at 60Hz, but we might differ in the definition of "fine" :-)
Moving windows around isn't smooth, resizing large windows is noticeably laggy, things like expose seem slow as well.