I also subscribed to Hulu so the wife can watch some Korean drama videos (remember how she hogged the Roku at my son's house on a previous trip?) on her own living room TV.
Each has its benefits: Amazon has a better selection of movies; Hulu has the Criterion Collection and Science Channel process-geek series (eg, "How is It Made," "How Do They Do Ii").
Most other channels require subscriptions, but I found at least two (FilmRise and Watch Free Flix) that offer free streaming of "discount dvd-type" old B- and C-movies. Mostly the movies suck, but at times if you find the right ones, they can be humorously entertaining.
Netflix is on my home screen because they're offering me a free trial, in hopes that I will subscribe. But for now, I think Amazon Prime and Hulu will suffice.
Yep, I'm now in Couch Potato Heaven.