I went with Channels specifically for the OTA recording when Google bought SageTV & killed it.
Plex, Myth & others are good, but Channels, like Sage, offers a much better non-tech end user experience for kids, spouses, older people - the set top boxes were bulletproof & easy to implement.
I just want Channels to recognize recordings by file name, so i can change the container & CODEC to anything (this, i believe, is how SageTV functioned - take the OTA MPEG-2 to h.264, keep the file name the same & it recognized it in the library)