See through it? Nah, but wish it wasn’t there? All the time. Always hated how TVs ruin a room. However, I don’t think this really solves the problem, for all the reasons others in this thread mention.
For transparent TVs, I don't see how those are useful at all, except as a novelty or for retail advertising or the like. If they could be transparent when turned off, and then when powered on show an image that looks as good as a normal TV, then I could see the appeal, but (AFAICT) that's not how they work.