I just started trying out Instant TV on my Roku Premiere+ and have found two showstoppers:
The commercial skip is so bad that it's practically unusable. What it really needs are a 30 second skip forward and an 8 second skip back. What it has is a fast forward that gives you no preview as you fast forward. So you just have to go forward for a bit and then see if you have skipped the commercials.
Lack of 5.1 sound on playback is another showstopper.
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