This thing works great for storing LOTS of 4K footage via my Panasonic G7 with no buffer issues or recording lag. Every once in a while the recording won't start, but this is SUPER rare. Fast card with great fast copy speed when transferring my footage.

I bought this because I was needing a card that was about 124 GB. I am aware that a 128 GB card will not actually have 128 GB on it. However, this thing is only registering as 116 GB. Do not buy it if you need more than 116 GB. If you do, you will need to get a 256 GB card.