I agree. I had an old slingbox and recently upgraded to the the Slingbox 350.
I was dissapointed to learn that they don't have a dedicated app on Windows to playback and went with the browser option.
I used to love the ability to have a no-frame small window that I could playback my tv with. Now with this browser approach being used, you cannot playback and have a window that is always on top and also have the browser's window frame removed.
Please Slingbox development, bring back support for the 350 on your Windows app!