While we have not yet watched anything on them as we spent the evening setting these services up, my initial observations are extremely positive. The Roku has a much better interface than the PS3 that we've been using with more options (especially Disney+) available. It also has a voice recognition function that searches all available services for specific shows or movies. I'm also happy that the Roku uses significantly less power than the PS3, making me less self-conscious about the energy use of our TV viewing. That the remote works for the TV as well is another welcome bonus.
Meanwhile, Disney+ blew me away with the number of shows and movies available. It certainly fills any gaps that I have in my movie collection when it comes to Disney, Lucasfilm, or Fox. I was particularly happy to see Willow and Three Men and a Baby on the list (don't judge me). The boys were thrilled to see that they could watch Phineas and Ferb again, while Janelle was commenting on the classical Disney films that she saw pop up on the intuitive menu system.
Now I just need time to finally see if Baby Yoda is worth all of the hype.