Make sure you try the Amazon channel and like it before you drop Netflix. We have Amazon Prime and do most of our on line shopping there but the Amazon channel on the Roku is not very easy to use compared to the Netflix channel. You need to waste a lot of time looking for the program you may want to watch, nothing at all like Netflix where the next episode is there waiting when you pick a series. The layout of the Amazon channel is poor, making it more difficult and time consuming to find what you want to watch compared to Netflix.
However, as I wrote, we have been using Amazon Prime for a few years now and Amazon is the first place we shop on line, even without using the Amazon channel on the Roku we like Amazon Prime.