Intended use case: Expanded storage for my phone, the Samsung Galaxy Note 8. I intend to use this for images, videos, movies, and as many apps as possible. This product as a solution: I have used Samsung SD cards for years in GoPros, cameras, phones, etc. and I can honestly say they are the best. Fastest transfer speeds, secure, and I've only lost data from a corrupted card once or twice (in about 9 years of use). Needless to say, the card functions perfectly. Be aware that some apps will not be able to move to an SD card, but that is to optimize performance and fine. Slow-mo video must also be recorded on the native storage. 128 GB is more than enough for plenty of movies, photos, games, etc. This card will not disappoint.
SIDE NOTE: Do not skimp on SD cards. The extra money is minimal and totally worth it -- trust me.