Despite my misgivings, “Ships from and sold by Amazon.com” suggests I could return a Sandisk 32 GB High Endurance MicroSD card if things turned out badly:
Unlike the Samsung cards, Sandisk charges a substantial premium for not buying through Amazon.
Verifying the card using f3probe produced the same results as with the earlier 64 GB card and copying the existing files from the Fly6 card (on the left) went smoothly:
rsync -rtv /mnt/Fly6/ /mnt/part
“High Endurance” means it’s rated for 5000 hours of “Full HD” recording, which they think occurs at 26 Mb/s. The Fly6 records video in 10 minutes chunks, each weighing about 500 MB, call it 1 MB/s = 8 Mb/s, a third of their nominal pace. One might reasonably expect this card to outlive the camera.
As with the AS30V, we shall see …
The Smell of Molten Projects in the Morning 
Not sure I understand what you mean when you say Sandisk charges a premium for not buying through Amazon.
Perhaps it’d be better to say Amazon sells Sandisk MicroSD cards at a substantial discount and sells the Samsung cards at MSRP.
Given that Samsung also offered free shipping, I bought their cards direct to get known-good merch at the same price.