Bought specifically for my Roku and they worked great. Roku sells MicroSD cards direct (regular 2GB), but with shipping, these faster 16GB cards were generally cheaper. I have 2 Roku 3s and 1 Roku Premiere+ and I turned off each device, inserted the card and when I turned it on it prompted me to format the microSD card. This process took about 5-7 minutes and now that little hassle of updating channels is gone forever! :) And since these cards have a higher capacity (which Roku won't take advantage of), they might be more useful for other applications in the future as well.
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