Makes little sense to upgrade to every new model every year, but there are still useful improvements to be had: * higher framerates for 4K: 60p, 120p * better

Makes little sense to upgrade to every new model every year, but there are still useful improvements to be had: * higher framerates for 4K: 60p, 120p * better battery life, 1h30m is sometimes plenty, and sometimes a little short * better (or in GoPro's case, any) image stabilization and vibration reduction * smaller size and weight, new mounting options