Review on Gigastone 256GB Micro SD Card | 4K Video Recording | Compatible with GoPro, Action Camera, DJI, Drone, Nintendo-Switch | Up to 100/60 MB/s R/W Speed | MicroSDXC Memory Card UHS-I U3 A2 V30 C10 | Includes 5-Yrs Free Data Recovery by Ryan Sandell

Since you are probably skeptical, I heard about all the fakes myself, it seemed too good to be true! $35 is what the most decent 128s cost! But it was a rather expensive 256 according to the packaging! Well, the packaging was right! In a cheap USB 3.0 card reader, I first ran speed tests and got 37 reads and 33 writes, making it a U3 class card, and then had to insert and remove some files. I started BIG, this was an upgrade of my 128 Samsung evo U1 in my Switch. It currently had 115 gigabytes of my installs on my switch. It took about 50 minutes to transfer these from the old chip to the hard drive with an average copy speed of 35 Mbit/s. Then I added a few files to the backup, brought it up to 155GB and put it back on the card. It lasted about an hour and 10 minutes at an average speed of 33 Mbps. Once loaded the Switch worked great, a few random Switch games played just fine. I am very impressed with this update and wish I had done it sooner!