I bought this to replace a Chromecast I'd previously been using, and find it far more stable and user friendly - having a dedicated remote helps.
The only thing which is a bit of a drag is the long start up time, I know this could be overcome by having the Roku mains powered, but I like the discrete option of having powered from the TV's USB.
Picture quality when using Netflix & iPlayer appears to be excellent.
Roku Streaming Stick User Review
Excellent ProductReview of Roku Streaming Stick streamer by NickParks, May 6, 2014.This item was purchased for 49.99 from Roku Website in 2014. The reviewer still owns this product.
Networking, Internet, Streaming quality9
Set up, Menus, Remote9
Value for Money9