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I love mine too. Biggest downside is when someone is watching the home tv dedicated to the sling, you can get into remote wars from half way around the world.
Which can be solved by attaching your Slingbox to a dedicated cable line/box/DVR (not connected to a TV).
I just got a Slingbox Pro and it's great. The picture quality is better with the display minimized and its certainly at the mercy of your internet connections on both ends, but overall, I love it.