"Excellent for my mobile phone"

Realistically I probably could have gotten away with a 16GB card, but like anything, it's better to have it and not need it than to need it and not have it. Popped it into my moblie phone an put all my music on it, plus enough room for photos or videos, etc.No hiccups or errors yet and holds a ton of stuff.

"They work if the device handles it."

I bought these for my kids tablets and for their action cameras. They work in those 2 devices. Some other devices seem to like the slower cards.