The feature-set and price point of the DJI Osmo Action make it pretty obvious from the get-go that it's an attempt to undercut the GoPro HERO7. Does it succeed? Like all things, it's complicated. The front-facing screen is a boon, the stabilisation is just as silky smooth as the HERO's, and it's wallet-friendly price is nothing to sniff at. That's not to say it's perfect; there are a few lag issues at high resolutions, the app can be unreliable, and video from the HERO is a touch flatter, which counts in professional realm when it comes to the grade. For an affordable alternative to the HERO7 Black though, the Osmo Action is a fantastic choice.
Yes, it does cost a few pounds more than your usual disposable camera, but you're getting a waterproof camera, for heaven's sake! Fujifilm says its plastic case is water-resistant to a depth of 10m, so it's likely you're going to be in trouble long before the camera is. The Fujifilm Quicksnap Marine comes loaded with 24 exposures of Fujifilm ISO 800 Superia colour negative film which you should be able to get developed at any regular high street chemist or online photo lab. Control is limited, obviously, in that there isn't any. The exposure is fixed at 1/125sec at f/10 so really you're going to need good outdoor light to get decent results, but that's true of any single-use camera.
Before you start digging into the reviews, a few notes on choosing a cam that's right for you. You'll definitely want to consider frame rate, expressed as frames per second (fps). Some action cameras offer up to 240fps recording, while others only go to 30fps. For standard playback, 30fps is perfectly fine. It's when you want to slow footage down in editing to create dramatic scenes that frame rate matters. Footage captured at 240fps can be slowed down and played back smoothly at one-quarter speed. You may also want to go for a cinematic look, in which case you'll want one that has a 24fps capture option, the same speed used by most Hollywood productions.