@danj You seem very determined to push the OWC and Jetdrive products, and mentioned the Lacie, which are all very expensive products for the job that they do. Now it just might be my suspicious mind, but it feels a little less like giving advice and more that you are attempting to make a sale, earn a client?
I don't have the expertise that you probably have, and I'm not alluding to, however I have been looking into this type of upgrade for my A1425 Macbook Pro Retina, and can say, after reasearching this solution for about 6 months now, this is the first time I have ever heard of anyone saying that the OWC drives are faster than an 850 evo, which, as far as I can tell from the boards around the place, seems to be the most popular choice to do this upgrade through the use of an adaptor.
I think you may also be confused about the connector type on the late 2012 model. It is a sata interface, not m2, because m2 is not an interface type but more of a size standard as you can m2 sata drives or pcie I think (can't be bothered looking it up). Anyway, my point is, the OWC drives have a 3 year guarantee on them, the same as the evo's (and less than the pros), I find it suprising that you seem to think that an 850 evo will corrupt after reaching 75% capacity. If that was the case, wouldn't there be more than just your say so plastered all over the web?
The problem is that there is no clear write up "this is how you do it" if you wanted to utilise anything other than OWC. Full credit to them for putting in the hard yards and getting a product to market that encouraged others to enter, drove down prices and spawned a new little movement. Perhaps there is and I just haven't seen it.
@Damirperisa , I have just ordered an mSata vesion of the 850 evo, along with an adaptor for my retina, should be here during the week and will let you know how it goes. I really wanted to get the 2tb solutions, but couldn't stretch the budget
Sorry, forgot to update this. I updated using an 850 evo 1 tb drive from Samsung, trim enabled, from here https://www.mwave.com.au/product/samsung.... Ordered an adaptor on eBay. Put it together quite simply, I'm no computer expert nor builder, and it has been working a dream for the last few months. No issues. Speed is much better. But wish I had a 4 tb drive!! I can't vouch for the other products here, nor to their drawbacks, but I'm glad I went down the path of the evo.
FYIW I cannot recommend the OWC Aurua Pro X, at least not in the 2013 rMBP. See this thread: https://discussions.apple.com/thread/822...
Seems it is a known issue by OWC. I have had to return my drive and go back to my original Apple SSD due to frequent kernel panics & high CPU usage.