Anybody purchased or used a Roku streaming stick 4K ? Thinking about getting one . Thanks

It's for our non-smart Sony TV which is about 10 years old but awesome picture and never any problems , just thought I'd turn into a smart TV , Roku stick was suggested by one of my long time customers .
I use one on a non-smart tv and one on a smart tv that doesn't have a very good wifi connection. The stick works great for me. One thing I learned is that I had to plug the power for the stick into my tv so that the stick turned off when I turned the tv off. When it was powered by the AC adapter, my bandwidth usage went way up, even with the tv off.