It offers 8K 60 fps video and great low-light capability, but it’s more expensive than its rivals. Steve Dent for Engadget RATING : 8.7 / 10 Pros Video quality beats all rivals Good in low light Excellent battery life Best stabilization of any action cam Cons A bit heavy Expensive With the biggest action camera sensor yet and open gate 8K video, the Mission 1 is GoPro's most important new product in years. The two fixed-lens models — Mission 1 and Mission 1 Pro — promise sharp, color accurate video with excellent dynamic range, along with better low-light performance than other action cams. They're also waterproof, durable and deliver smooth video of extreme action, as you'd expect from a GoPro. However, there are some tradeoffs with a large sensor. The biggest is size and weight as the Mission 1 Pro is thicker and heavier than the GoPro Hero 13. It's also $270 more than that model and its competition.…