I have the Roku boxes. Not sure how this any different.
For what it's worth Roku and Amazon Fire both have stick versions of their streaming devices that are around the same price. I don't have any experience with anything but a Roku 3, so I can't give you any information beyond that.
Yep, that's the reason I got the Roku. It works rather well and can stream 1080p video from my PC over wifi without any issues.Are you using Plex with you Roku 3?
My Amazon sticks are in the mail