I've got the SlingBox Pro (not the HD), which is a discountinued model...
I have 3 inputs (arguably 4 are available)... The fourth one is just a straight coax with the expectation that it's an analog cable or OTA antenna input...
The mobile app is great...but I have to say that my ability to connect to it is spotty... I sometimes wait forever as it times out because it cannot connect...
Also, some of the buttons on the app don't work for me...as an example, the "listing" button won't bring up the now playing list on TiVo... I have to go into settings (which brings up the main menu), and then select the NPL from there...
I wonder how I can modify some if this so that it works well...