Well - its almost exactly 2 years since my last post about this so I have an update and a question if anyone has any input.
I ended up buying the DELL 4k, P2715Qt. I was able to get a really good deal - way cheaper than an Apple (although an Apple would have been a heap better, Jeff!) .
So , when I got it, the MBPro (round about a 2014 or 2015) worked flawlessly with it. Great result and everything I had read said it worked, with the Thunderbolt connection.
To cut a long story short, Apple replaced the unit with a 2017 unit which came with USB3. I got adaptors for the HDMI - not Apple ones - and although it works, it takes about 3 goes to connect fully. The MBPro sees the Dell but the picture doesn't display first time.
I have read all sorts of stuff about connection and display issues (mine is still displaying at 2160p so that's good) and wanted to ask whether anyone had the same setup without the setup hassle.
I should add that I have also read that the MultiPort Adaptor (https://www.apple.com/shop/product/MJ1K ... rt-adapter
) is the only way to go but ay AUD100..., I'm pausing....