Very slow at streaming. Some of the services are marginal at best. For instance, the audio quality when streaming Pandora is very poor. Many of the "free" movie services come with lots of commercial advertisements. You Tube works reasonable well, although it occasionally locks up.
I bought a ROKU a few weeks ago, at the same time I bought a new router and upped my internet speed to 60 MG. Everything got faster with the new router and internet speed but the ROKU is still extremely slow. IT works but there is a lot of the spinning loading symbol. For someone who is use to being able to move channels pretty quickly, I feel like I am constantly waiting on this thing to load.