Does the sling adapter work? We have it, but when I try to watch something from my iphone, sometimes i get the "unable to sling" message on my iphone. Is this still a work in progress? We got the sling adapter hoping to cancel netflix, but if it only works sometimes, I guess we will hold off until the bugs are fixed. Am I missing something? I was told that you could watch a DVR program without it taking up a tuner, so the "tuner not available" should not apply. Anyone have any info for me?