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First of all, as a non-native speaker this is very difficult to read (but I think native speakers will have a similar problem). Secondly, its absolutely not clear on what constitutes 'product, any article or service'. Is it a clearly defined part/add-on/component or can it be anything? Basically, does it mean that I can go resoldering all the capacitors on my logic board with others and/or replacing the PSU by something I have built in my kitchen and then insist that my warranty is in effect? In case of the rMBP, Apple clearly states: 'this product does not contain any user-replaceable parts'. Isn't that 'enough' in this case? Now, the Act basically means that you can use any brand of external HDD, usb-stick or other device in combination with your Mac, but I don't see how altering the product (that is, the laptop) itself falls under the definition of the Act.

P.S. In electronics, there is often no way to easily 'prove' what caused the damage or even to identify the failed part, thats why people usually don't even bother.

If you read the entire Act and the cases that have followed, it is clear. The Asus EeePC example I gave was exactly Asus trying to say "there are no user serviceable parts" inside. Asus even had a sticker on the case that said if you remove this your warranty is void. I understand you are taking the capacitor example to an extreme to make a point, but in the Apple example, a bad cap. on the logic board would still be covered by the original warranty, so I'm not sure that is the best analogy.

I have already said I agree this is not without risk for the reason you mentioned. All I am saying is your warranty is not automatically voided if you replace the flash storage device.
 
At the end of the day, I'd go with a genuine Apple flashdrive anyway.
I've done this for my MBA with great success and also economically viable (I could sell my removed SSD for 1/2 the price of new drive on eBay).
I understand, that the availability of new PCIe flashdrives is nowhere that generous yet. But once you arrive at the point of the upgrade need, the situation should have improved.
If you need it already today, then you need to ask why you've purchased a underspec'ed machine in the first place?
 
ordered this morning

Refurbished 15.4-inch MacBook Pro 2.6GHz Quad-core Intel i7 with Retina Display $1,829.00
Recycle fee :apple:

can't wait to get it.
 
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