Camera's like the Sony FDR-X1000V do not accept basic U3 cards as they will not record in 4K (as the camera is so fussy). The camera has record bit rates up to 100mbps. Yes, your Samsung card is 'capable' of 4K recording (I own a few myself), but they are not fast enough for cameras like this and disable the 4K and high bit rates on normal U3 cards. These Extreme Pro's are one of the few recommended cards. Won't be a problem on all 4K cameras, but certainly a problem with the Sony. Paid this for a Amazon warehouse 64GB version a while back - this is a good price for the Extreme Pro, which has faster writes. This is why the 64GB version got very HOT at £19.99 yesterday https://www.hotukdeals.com/deals/sandisk-extreme-pro-64gb-microsdxc-memory-card-1999-base-3019731?page=1&newcomment=34835597#comments-new Benchmarks: https://www.cameramemoryspeed.com/reviews/micro-sd-cards/
Lot of reviews suggest the cards are fake, not sure if they are the cards sold by Amazon (and not 3rd party)
What's a suitable description for just how cold this deal should be when you compare to this Samsung for £24.99?! Brrrrr!