Hi Everyone, Just bought a Playsport ZX5 and been playing around with the video. First impressions: very well made, grainy in low light but image stability works great.
You must upgrade firmware on board to 1.3 to prevent lock ups and freezes (mine bought yesterday came with 1.0 and caused problems). Have done a couple of comparisons at 720p / 30fps with my Samsung Galaxy S2 mobile.
For me, the Playsport is about one half a stop under exposed, otherwise it's great.