This is our second Roku Stick purchase, and they have worked well with both (Vizio) TV's. One of our main needs was to access our Time Warner service without needing another set-top box and monthly payment, and this fit the bill.
With it supporting the 5 GHz WiFi connection with my Router, speeds are excellent, and buffering is rarely encountered.
Netflix works great, Amazon Video works great. Also added Acorn TV which also streams quite nicely.
My only dissatisfaction is with the Interface for the Time Warner App. There is no easy way that I've been able to figure out to efficiently find a channel. I have set up favorites, which helps, but some way for numeric input would be much more efficient.
I bought this about a month ago. It was a great price for what you get. Fast streaming and awesome connectivity. It runs well even on my stressed wifi.