Mark Klopf
Once I figured out the S3 wasn't liking the exfat file structure and formatted to fat32 it works quite well. I don't know if it's the phone or card and I'm not about to test it elsewhere, but I didn't see the 30MB/s speeds. It works good enough for the phone and it's the best option I have for the biggest storage for now.1080P videos with no issues. No problems with read/write stability. Overall I'm happy I bought it.