We took the T-Rex 3 on a 4 day backpacking trip and a handful of trail runs before writing this up, and the short version is: it does everything a Garmin Instinct does for about $100 less. Thats not nothing.

The 1.5 inch AMOLED hits 2,000 nits, which means you can actually read your pace data in direct sunlight without shielding the screen with your hand. The stainless steel bezel picked up some scratches from rock scrambling on day two, but the screen itself held up perfectly. GPS accuracy was solid in open terrain and only slightly drifted under heavy tree cover, which is about what you’d expect from dual band positioning at this price point.

What caught us off guard was the health tracking depth. Blood pressure monitoring, skin temperature, altitude acclimatization alerts. We didnt expect that much sensor data from a watch that markets itself as a rugged outdoor piece. The Zepp app organizes it well enough, though the interface can feel cluttered if you’re coming from something simpler like a Casio or basic Garmin. Fair warning: the notification system is view only. You cant respond to texts or dismiss calls from your wrist, which might bug people who use their watch as a phone extension.