If anyone wants a recommendation for an alternative, I've had a good experience with the Crucial X8 4TB external SSD. Not quite as fast as the SanDisk Extreme Pro but pretty decent. Wouldn't trust it 100% though. (Also after writing ~300GB continuously the write speed falls from ~900MB/s to 90MB/s).

link: https://www.amazon.com/varencs-4tb-ssd-rec-ps-did-you-know-y...