I'm also using the Smart OSD. It does a good job and I haven't been doing the recent updates. Updates for a long time were a bit challenging as they went through growing pains. Just started a rebuild to try Hoverfly with Castle Phonenix 50 ESC's. BL temps were always on the high side and many times right at 100c in the summertime. HF has an OSD on their GPS board but it is probably std video. Don't think I have ever seen an HD output. The challenge for HD is probably more a factor of camera and transmitter than the OSD board. I've seen discussions on things like the Terradek (?) and at multiple thousands of $$$ don't need HD THAT badly.