Your experience mirrors several other peoples' "the only experience where the device really provided a knockout experience was when viewing panoramic photos" I

Your experience mirrors several other peoples' "the only experience where the device really provided a knockout experience was when viewing panoramic photos" I believe that this feature alone is enough to provide a "killer feature", I'm trying to work on it but I don't think I will get there as a side project :( (I did apply twice to Y Combinator and other incubators, no luck)