I received my 32GB order on 13 July, just before the promised date by Amazon's Global Priority Courier Shipping. I can confirm this package works great with Apple's pre-installed RAM. But it works best when it's used alone.
I did some tests with different configurations:
8GB (Apple 8GB)
Single-Core Score: 5288
Single-Core Memory Score: 5086
Multi-Core Score: 15223
Multi-Core Memory Score: 5075
40GB (Apple 8GB + Corsair 32GB)
Single-Core Score: 5455
Single-Core Memory Score: 5644
Multi-Core Score: 16365
Multi-Core Memory Score: 6127
32GB (Corsair 32GB)
Single-Core Score: 5480
Single-Core Memory Score: 5773
Multi-Core Score: 16461
Multi-Core Memory Score: 6312
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