I will not be considering it for $20 with the initial limited lineup. For the same $20 you can get both Dish and DirecTV basic package that include the locals, DVR, more channels plus valid credentials for authenticated on-line viewing and 90 day promotional premium channels (HBO, Showtime, etc.). It is uncertain whether you could use Sling/Dish ID and PW for authenticated on-line viewing.
I can already get my locals free via QAM and NimbleTV and already pay $16 for Hulu and NF. Not sure if I'd pay an extra $20 just to watch my favorite network TNT. So far, I've been able to watch my TNT shows and AMC Walking Dead via PLEX so not sure if I would want to pay $36 for TV when I can watch everything for $16 or less.
However, eventually they will add more content or a promotion that will make me re-consider. With that said, I will be "on the lookout" but not take the plunge when it is released.
2xRoku2 XS,Roku1+SE,Logitech Revue GoogleTV,Raspberry Pi+XBMC,Mac Mini+EyeTV DVR+RabbitTV+PLEX+Kodi,TiVo Premiere,Sony BluRay+streaming apps,Equiso Android TV,FireTV,Nexus player,Simple.TV Local TV:QAM from ISP coax line. PLEX+unsupported apps