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Its biggest problem is limited apps and Amazon centric operation, however if you can put up with this then it is a cracking piece of kit.
I personally I would go with the Roku 4K stick (Same price) as it has a separate airiel built into the power lead for a more solid performance, as well as more comprehensive apps with no preference given too them, and while it doesn't have DV etc. most serious viewing is done by a projector, so is irrelevant anyway. (From the description in the review you did on the cheaper Roku it obviously had serious Wi-Fi problems hence such a poor picture quality)