OK, I just bought a copy of Mirror for Sony for myself. And it works very well. My computer is linked to my TV over my ethernet network, so bandwidth isn't a problem. Mirror for Sony linked to my TV without difficulty. I expected some but there was none. No setup issues. I clicked buy after the two minute trial, and a serial number was included in my receipt. Pasted it in and it was a go. I'm watching the new Star Trek over CBS All Access, via Amazon Prime. I was displeased with the service because it only worked with my computer. My TV was not authorized. But I don't like watching video on my computer. Though the monitor is on my 2013 27" iMac is fine, my 55" TV is better. I also dislike CBS All Access because the programming includes commercials. For a paid service, the programs should be commercial free. So I may cancel the service after I watch the two seasons of Star Trek. The limitations are a pain. Which is why I bought Mirror. I'm glad it works as well as it does.
That said, the picture came across at full resolution, with none of the usual streaming artifacts or hiccups. Of course I have an excellent router with above average bandwidth, so this channel, at least, streams well.
I don't know why there are no other reviews, so I hope this will encourage others to give Mirror a try. I suspect versions for other smart TVs will work just as well. If they don't, we should hear about it.