We have the Roku 3, too, and are amazed at all it packs in at that price. However, we were short on a back-of-the-TV HDMI slot and bought the stick to put in a side-of-the-TV HDMI slot. That solved all of our capacity problems, and we really do love the functionality of the Roku stick. Too bad it's so slow to start up, though.
I own a Comic Book Store, and I have the streaming stick plugged into the TV on the wall. It's a real workhorse, with Netflix, Amazon, and Plex we can play just about anything. before this we had tried a bunch of other solutions, none of them as seamless at the Roku Stick.
I'm very pleased with Roku. It has a great UI and menu for easy navigation. I only wish that I could access all of my content. There is not a way(as far as I can tell) to stream any Google Play Movies content. If they add this it would be great. Otherwise I love the news feature the most and this is a great way to stream content from Amazon, Netflix or other Web streaming service providers .
Our family always loved ROKU, and what it did for us. However, for the last 3 months, our remote does not communicate correctly with our Streaming Stick. We have rebooted, reconnected, upgraded our modem & rotor, changed batteries often, but we still can't get the remote to talk to the stick correctly. Sometimes it doesn't work at all. And we are only a few feet away from the TV & stick!
So I am sad to say that we are very unhappy with this ROKU product, even though our other 2 ROKU boxes work perfectly in other rooms for us.