Yes. My Mits supports 1080i, 720p, 480p, 480i.
BUT here's what I think happened:
I put it in Native mode, but I was on BravoHD+ (which is 1080i), so I thought it was just going to stay in 1080i when, in fact, it was going to change whenever I changed channels (to each channels native mode).
One problem with being in native mode though: When I switch to an SD channel, my TV cannot display it because I'm connected via component. My component DTV input on the TV only support HD and not SD. So, any time I want to watch an SD channel, and I want the Voom receiver to be in Native mode, I would also have to switch inputs on the TV. That gets confusing for my wife so I may just have to upconvert everything to 1080i. I wish there was a constant 720p mode.