Bests & Worsts Reviews from Amazon

I purchased these as additional backups to my older "Lexar Professional 600x 16GB SDHC UHS-I Flash Memory Card LSD16GCRBNA600" thinking that they would be similar or maybe slightly better performance in my Nikon D7100. Oddly, it turns out that these, unlike their predecessors, are SO much slower when shooting RAW at higher frame rates. The Nikon D7100 has a small buffer. To alleviate some of the pressure off the internal memory I have used both the older Lexar cards mentioned above (also the 32GB models)and the SanDisk Extreme PRO 16GB UHS-I/U3 SDHC Flash Memory Card. All worked amazing. Never had any significant issues or missed a shot. I started using these newer versions and the camera would take three shots and then the frame rate would drop to about 1 frame every 1.5 seconds. With the other cards, the frame rate would drop to about 3 frames per second. That seems like a big difference for a card claiming to have similar or better capabilities to older products. It also seems to read slower than the other cards too. I reformatted the cards in the camera but it made no difference. Not exactly sure why the drastic reduction in performance has occurred, but it is disappointing when compared to older models of this card.