I currently use a Slingbox Classic and watch a SD DirecTiVo (DVR) while abroad. I do not need HD resolution.
I view the content on: Mac, Windows, Slingcatcher and mostly on my Android tablet.
Although supposedly the Slingcatcher and Slingplayer Mobile do not support the Slingbox Classic, they both work OK.
So my question is this:
Are there efficiency improvements that justify paying for the upgrade? Does it buffer more content? Do smarter or faster compression? Use better streaming protocols that provide higher reliability than the Classic does?