dropped my i9 5500 off at UPS today, once apple receives it they will issue my 5600 upgrade. I have paid nothing for the upgrade.
As a reminder - I had 5 replacements starting with 3 i7 5300 who overheated, apples encouragement to pay more and upgrade myself to the i9 5500, and then a replacement on that (due to constant kernel panic crashes and overheating) and now it has been returned, with a 5600 soon to be shipped.
I was persistent, I will be without a machine for a while, but I have been able to have apple acknowledge it is a problem, and obviously they believe the HBM2 memory does not exhibit the same issues - or why else issue me an 875$ upgrade.
apple won't do anything for you unless you have had at least 3 attempts to fix the hardware, I have on my file 5 apple store visits, all the capture data time spent with the techs and specialists, and the 3 different senior advisors who have said "not ok".
so there you have it. I would not expect you will get the same treatment, unless you have exhausted the same avenues of repair, but, worked out in the end for me I suppose... again. I don't have the new machine in hand yet, so I'm still partially holding my breath!