Amazfit T-Rex Ultra 2 In-Depth Review: A Serious Contender to Garmin?

Hardware and Design

• 🚀 The Amazfit T-Rex Ultra 2 is a large, 51mm smartwatch featuring a 1.5-inch AMOLED display with a peak brightness of 3,000 nits, making it highly visible outdoors.
• 💎 Construction includes grade 5 titanium for the bezel, backplate, and buttons, with a sapphire lens for durability and 10 ATM water resistance.
• ⌚ The watch uses 26mm quick-release straps, compatible with Garmin's Quickfit bands, and offers a combination of four physical buttons and a responsive touchscreen for navigation.
• 🔦 A built-in LED flashlight with adjustable brightness levels is included, accessible via a long press of the upper left button.

Battery Life and Performance

• 🔋 Amazfit advertises up to four weeks of battery life with typical use, but real-world testing with all features enabled (always-on display, sleep tracking) yielded approximately two weeks.
• ⚡ For outdoor activities, battery life is rated at 50 hours in highest accuracy mode without a route, and around 28 hours with a route, with real-world tests largely confirming these figures.
• 🗺️ GPS accuracy is described as solid and crisp, with total distances aligning well and tracks showing minimal wavering, even on tight corners.

Health and Sleep Tracking

• ❤️ The T-Rex Ultra 2 offers 24/7 heart rate tracking, calorie and step counting, stress monitoring, SpO2, and HRV.
• 😴 Sleep tracking includes stages, but the sleep scores and stages can sometimes be inconsistent compared to other wearables like Aura Ring or Garmin, with instances of registering sleep before actually falling asleep.
• ⚡ The BioCharge feature provides a dynamic energy level indication based on sleep quality and prior day's activities, while the Exertion target aims to predict optimal training loads, though its exact functionality and integration with other metrics remain unclear.

Sports Features and Navigation

• 🏃‍♂️ The watch boasts a vast array of sport profiles, including standard activities like running and cycling, as well as more niche options like hula hooping and board games, plus recreational scuba diving capabilities.
• 📊 Advanced running dynamics such as stride length and vertical oscillation are tracked, and a new workout notes feature allows for voice memos during activities with automatic transcription.
• 📍 Global offline maps are pre-loaded, with additional map data required for full functionality like contour lines and on-demand routing; the watch has 27 GB of usable storage.
• ⚠️ Navigation features, including turn-by-turn directions, elevation previews, and off-route alerts, show potential but suffer from bugs like premature alerts and issues with route processing, indicating a need for refinement.

Accuracy and Comparisons

• 🚴 Heart rate accuracy during activities varies: it's generally good for indoor cycling but can be affected by wrist movement during road and gravel riding.
• 🏃‍♂️ Running accuracy can be impacted by cadence lock, where the watch may mistake cadence for heart rate, especially during intervals.
• 🏋️ Weight training and HIIT present challenges for optical heart rate sensors due to wrist tensing and arm movement, leading to potential inaccuracies, though external sensor support mitigates this.
• 💲 Priced at $550, the T-Rex Ultra 2 competes with premium watches like the Suunto Vertical 2 and Coros Vertix 2, offering comparable or more features on paper, but with some software quirks, particularly in navigation, compared to more established brands like Garmin.