Agree with Brian Conrad and MovieGeek;
Using a ROKU XR, the device works fine on a 1080 flatscreen.
I thought that the XR model would allow 1080, versus the HD model, but when reading the specifications it only facilitates N-WIFI. As I now use a Netgear N-WIFI, I elected to purchase that model. And it does work very well integrated and connected into our WIFI net.
Of interest to others might be a non-technical subjective comparison I did of Netflix playback on a Win 7-64 bit Media Centre PC, and Netflix using the ROKU, with HDMI connection. This study of mine utilised the online film " NORDWAND " or North Face Eiger, an HD streamer in the Netflix library. I chose this film as I know the area, used to cycle up on an old one speed as money was tight, to campout and climb, and know the story.
NETFLIX-WIN 7 PC using MEDIA CENTRE:
The PC version is darker, and not full of highlights or details: SD quality.
The ROKU XR version is clearly better, HD quality at 720, with more detail and more colour.
Both use a B&O Beosound 3200 with Beolab 4000 speakers, so the digital audio is excellent and the same quality.
I decided to further to brave the storm, take my own personal view out of the picture, and stick my neck on the chopping block on this one. I sat my wife down with her critical European eye, and let her look at both versions, starting with the Netflix Win 7 option. She dislikes climbing films as I banged up my head years ago in a rockfall while climbing, so this test was ACTUALLY DANGEROUS to my health.
When I switched to the ROKU device, her learned and final reply then came: " Now that's more like it. " Critiquely, she watched the entire film. Wisely, I will leave it at that.