I ordered two 32GB and two 64Gb versions of these memory cards (but I can write only one review per Amazon). Two 32GB cards went into a camera and a cell phone which only accept up to 32GB cards -- and one 64GB card went into my Samsung Galaxy S3 cell phone. The second 64GB card's a spare.The Galaxy S3 phone accepted the 64GB MicroSD card with no problems -- except for the fact that my Galaxy S3 only recognizes 59.7GB of the 64GB MicroSD card. I have no idea why it does that and why I lost over 5GB of an empty MicroSD card but I'm okay with that -- I guess. 60GB's is still plenty. The transfers of music, videos, and pictures between the phone's internal 16GB memory and the 64GB MicroSD card is wayyy faster than the old SanDisk 16GB MicroSD card that was in there. The same noticeably faster speeds between my desktop computer and the 64GB MicroSD card were also smile inspiring.As for the SanDisk MicroSD cards -- they work great and seem to operate pretty darn fast. They're definitely faster than the old 16GB SanDisk MicroSD cards I had installed in my camera and cell phone(s).Now -- as for the shipping -- dismal! I ordered two 32GB along with two 64GB MicroSD cards on August 21 during an Amazon Gold Box sale. According to the tracking feature they didn't even transmit the shipping info to the carrier (USPS) until August 31. All four were shipped together. I didn't receive them until September 6 -- a full 16 days after I ordered. A little over two weeks for four tiny items that were indicated on the Amazon page as being -- "In Stock. Ships from and sold by Amazon.com" -- at the time of purchase. They also shipped all four tiny MicroSD card packages in a way over-sized box which the USPS couldn't fit into the mailbox so I had to make a cross-town trip to the US Post Office and stand in a very long and slow moving line to pick up the box. They could have all four EASILY fit in one small envelope. Even a small padded envelope. I left packaging feedback on that already.This is the 3rd straight time that Amazon shipping was horrible over the last several months -- and that is why the 2-star rating. This is not the Amazon shipping that I remember.