I've been using Sandisk products for well over thirty years now and I have yet had a major problem with any item. They were pretty much the only game in town if you needed any kind of a flash drive product and it seems every year they come out with something new. Now after saying that I have no experience with these memory cards. Recently I purchased a couple of the little action cameras. One a HD and the other a 4K. The HD has a limitation of 32 GB and the 4K 64 GB. I'm hoping this one review will be allowed to be posted for both. Having no experience with this type of card I wasn't really expecting something so small. I don't do well with small things as I have bilateral Parkinson's which causes a lot of hand and arm tremors. Before anybody says it, yes I read the description of the cameras and knew the cards were going to be small to fit in the camera. My brain just didn't click when ordering. The size wouldn't had changed anything as I have aides helping me. I hadn't needed to worry though as I was able, with a little work to get the cards in the cameras. Both cameras advised that the memory cards needed formatting and formatted in the camera. I found the hardest part of getting these cards in the cameras was getting the cards out of their blister packing. Be sure you have a good pair of sharp and strong scissors. Once out the 32 GB card was first. The camera recognized it immediately and actually started formatting it. It took all of a few minutes. The next were the two 64 GB cards. The more expensive camera recognized them but I had to format them manually. Go figure. The cheap Chinese knockoff did a automatic format while the more expensive camera didn't. Being formatted it was time to check out recording something on the cards. Both cameras were set up and a couple of minutes of indoor and a couple of outdoor recording was done. I have to admit that getting the cards into the adapter and placed in my Ultrabook. My Ultrabook is 4K and I was really impressed with the few minutes of the recordings I made. Now I'm planning on getting my projects going. Oh I'm not going to say every Sandisk card is going to be perfect. It's just my experiences have been just that.This review was written without any financial considerations. A free product nor discount was received. Full Amazon retail was paid.