The Apple Watch has come a long way since its debut in 2015. And with the Series 4, Apple made its wearable even better than the previous model, thanks to a bigger, edge-to-edge screen; longer battery life; more-accurate step-tracking; and an electrocardiogram test that can detect an irregular heartbeat. That's in addition to being water-resistant and working with thousands of popular apps out of the box, which is what makes the Series 4 a well-rounded package.
The Apple Watch Series 4 starts at $399 for the GPS-only, 40mm model or $429 if you want the bigger 44mm screen. Meanwhile, the LTE version, which lets you make calls from the Watch without a paired iPhone nearby, costs $100 more. If you already have an iPhone, though, your best option may be the GPS edition, since you can still make calls from your wearable as long as your smartphone is within range.