GoPro is still the leader among action cams in terms of performance. SJ had some issues before but pulled it through with firmware upgrades. Xiaomi on the other hand is very promising in terms of quality, reliability and price. It's the cheapest of them all but surprisingly good.?
{"Image Orientation": "Horizontal (normal)", "Image XResolution": "72", "Image YResolution": "72", "Image ResolutionUnit": "Pixels/Inch", "Image Software": "Adobe Photoshop CC 2015 (Macintosh)", "Image DateTime": "2015:09:05 00:31:54", "Image ExifOffset": "172", "Thumbnail Compression": "JPEG (old-style)", "Thumbnail XResolution": "72", "Thumbnail YResolution": "72", "Thumbnail ResolutionUnit": "Pixels/Inch", "Thumbnail JPEGInterchangeFormat": "310", "Thumbnail JPEGInterchangeFormatLength": "5271", "EXIF ColorSpace": "sRGB", "EXIF ExifImageWidth": "1916", "EXIF ExifImageLength": "1200"}