Apple clearly believes smartwatches are here to stay - the Watch 4 utterly proves that. The design alone is a big upgrade, with the screen offering far more visibility, and while the health benefits are only going to help a subset of users, they're welcome and show the direction Apple is heading.

Larger display, Lightweight design, Louder speaker

Still on the pricey side, Battery life needs to be more than two days

The Apple Watch 4 brings some significant upgrades over the Series 3. For one, we have a slimmer casing, slightly bigger screen size and improved pixel count, offering much better screen visibility.

Big, bright screen, Good battery life, Impressive health features, Better fit in thinner body

No always-on display, Running data still behind Garmin, New flush side button is harder to press

The Apple Watch 4 is an amazing smart watch and, quite simply, the best money can buy; but you have to own an iPhone to make the most of it

Larger screen, Thinner, Excellent performance

Battery life still not great, Expensive, No sleep tracking

It’s bigger, it’s better-looking and it could save your life

The larger screen (30% larger no less), especially as the Watch itself has barely grown at all. The Series 4 comes in 40mm and 44mm versions (measured vertically), compared to 38mm and 42mm for past Watches.

There’s no native sleep tracking, and even if there was the battery life is still too short to allow you to wear the Watch at night. The battery will last a day comfortably, but not two, so you have to plug it in every night.

The updated Series 4 Apple Watch is a fantastic wearable. The bigger screen makes a huge difference, as do the niceties such as the haptic feedback when you turn the crown. WatchOS 5 is by far the best of its type, and its easier and speedier than even on the Series 4.

We've been fans of the Apple Watch since the very first version, but most people are not like us. And this is a product line that's needed to work hard at broadening its appeal.

Apple Watch Series 4 is the best reason yet to buy a smartwatch

Sleek redesign, Huge, gorgeous screen, Novel health features

Significantly more expensive than Series 3, No always-on display option

All in all, the Apple Watch Series 4 is a very impressive bit of kit. Not only is it able to accurately track a host of workouts - being intuitive and a pleasure to use throughout - but it is also a beautiful and super premium lifestyle device.

Larger display, slimmer chassis, gorgeous design, lightweight, smooth performance and navigation

Pricey, battery life still only 2 days, won't track sleep natively, no always-on display option

Has there been a learning experience for Apple quite like the Apple Watch? Back when the original model launched in 2015, there was – not unfairly – a sense that Apple itself wasn’t quite sure what exactly it should do.

Mesmerizing new display, Fast and smooth performance, Health features could be game-changers, Battery life hasn't suffered

Siri still falls short, Expensive

The Apple Watch Series 4 contains the most significant improvements since the Series 2 brought onboard GPS to the smartwatch. Most notable out of all the new features are fall detection and ECG readings, as these have the potential to change people's lives or, quite literally, save them.

Bigger, better screen., All old Watch bands fit on the Series 4., Good battery life., Faster performance., Fall detection has the potential to be lifesaving., ECG features give users more control to monitor their health on a daily basis., Accurate auto workout detection and ending feature.

ECG app isn't available yet., WatchOS 5 drops support for Series 0 devices., New complications are only compatible with new watch faces., Still no support for third-party watch faces., Still no native sleep tracking., Siri has trouble completing Shortcuts.