I spent hours installing the old apple drive - installing HighSierra and then trying to update the Aura SSD (1Tb). I then spent an hour on text support with OWC. The answer is that the Aura SSD WILL NOT WORK with HighSierra. They have a rebate program where they want to sell you the Aura Pro X - which will work but they will only give a $300 rebate after you have purchased the Auro Pro X. I have been an OWC customer for years and this is a pretty bad way to treat customers. The old Apple SSD (flash) works fine but the Aura SSD will not suport High Sierra because of the need to have APFS. Somehow they have frigged the internals on the drive to some proprietary system and HighSierra is a no go.
Here is the transcript from OWC support:
Johniah T (17/12/2017, 19:58:06): So after taking a look at the drive that was ordered. I have realized that you do not have the Aura PRo X.
Johniah T (17/12/2017, 19:58:22): That is the drive that is compatible with High SIerra
Me (17/12/2017, 19:59:06): so what does that mean? is the drive i have never going to work with HighSierra?
Johniah T (17/12/2017, 19:59:11): Correct
Johniah T (17/12/2017, 19:59:32): But we have come up with a rebate program for that drive
Me (17/12/2017, 19:59:52): Ok - what happens next?
Me (17/12/2017, 20:01:24): ok? what happens next?
Me (17/12/2017, 20:01:57): the drive is just over a year old?
Me (17/12/2017, 20:02:45): Hi J, can you tell me about what happens next please?
Me (17/12/2017, 20:04:57): Johniah T - are you still there?
Johniah T (17/12/2017, 20:05:57): So. you place an order for the Aura PRo X drive get it home and make sure it works and then we can set you up for the rebate program to send the Aura drive back for a rebate refund check
Me (17/12/2017, 20:06:48): is there anywhere that describes this on you web site and if so please direct me there? DO I get a 100% rebate?
Johniah T (17/12/2017, 20:07:26): https://eshop.macsales.com/tech_center/support/rebates/ssd.cfm
Me (17/12/2017, 20:08:16): 1.0TB - $300.00
Me (17/12/2017, 20:10:12): you guys have to be kidding. that is just nuts - I have a product and it cost closer to $900 I am not confident enough to buy an Aura Pro X - what if next year that does not work with the next osx. Can you have someone email me please - you have my email address from the order. this is not fit for purpose
Me (17/12/2017, 20:11:49): ?
Johniah T (17/12/2017, 20:14:16): That is the only available option. We where not aware that the new operating system was not going to work correctly with the Aura. The filing system is different from the other operating systems.