I purchased two of these ridiculously expensive PSV memory cards from seller APEX GAMES (USA) with FBA (fulfilled by Amazon). I originally only purchased one for my husband, but after browsing Amazon and getting great deals on PS Vita games it only made sense to just get one for myself. I do want to note beforehand that the cards I received from APEX GAMES (USA) are the Asia version (Taiwan/Korea - PCH-Z641G), NOT Japan version (PCH-Z641J) like stated in the description and title. Because of this I knocked off one star as I did not receive the actual version I paid for. After reading up on differences and seeing that the G version cost more on the play-asia site (where PS Vita is commonly found), that site states the J version may experience issues with PSV 1000 devices (aka fat vitas). Now I don't own the PSV 1000, but the 2000 slim so I decided to keep the G and tested them out. So far no issues only time will tell when and if these cards deteriorate with excessive use. I was able to transfer a small saved file I had from my internal slim memory onto the card without any issues. I've read issues with both G and J versions so whatever card I got would of been a risk either way. Leave it to Sony to make a proprietary memory card that might and might not work overtime with such a high price tag. Both cards gave me 60gb of free storage. If you are wondering where the 4gb went, simple answer is system data after formatting.
UPDATE: I ordered a third 64gb PSV memory card for another PS Vita, but this time from seller cus mart and got exactly as advertised! BRAND NEW SEALED PCH-Z641J and is in working order. So far both Japan (PCH-Z641J) and Asia (PCH-Z641G) versions of this 64gb memory card has been working perfectly since purchase. NEVER remove the memory card while your device is on/sleep mode, high chances of file corruption.
UPDATE #2: Ordered another memory card for my 4th new silver PS Vita from seller NuBlissful with FBA (Fulfilled by Amazon). Card came brand new in original packaging as advertised and is working great!