I think it's a trade off. After testing several headphone models—including the Gemini2, AZ100, Rex5, Pi8, and Beoplay Eleven—and previously owning XM5, in terms of audio quality, the Rex5 clearly stands out above the rest. While it may not offer the most comprehensive package compared to some other models, the sound quality is unmatched.
When evaluating Active Noise Cancellation (ANC), the Rex5 falls short compared to the Sony, Beoplay, and AZ100. However, it performs comparably to models like the Pi8. Regarding the accompanying apps, AZ100 and Beoplay Eleven provided excellent user experiences, while Sony's app is solid, and Pi8's app experience was notably poor. I've found the Rex5 app effectively meets my needs, and this aligns with other user reviews I've encountered.
Choosing suitable tips can easily resolve the Rex5's dependency on the right ear tips, so I believe it's unfair to significantly penalize it on that front. I tried a bunch of tips, and the AZIA Origins worked best. I tried 4 or 5 sets
However, the limited water resistance of the Rex5 is a critical consideration. My solution was to use two sets of wireless earbuds. The Rex5 remains my go-to choice for daily listening due to its superior sound quality. For workouts and outdoor activities, especially in wet conditions, I've opted for the Beoplay Eleven, which offers the best balance of overall features and sound performance among the tested models. Since the Beoplay's are expensive, I think the AZ100's are the best bang for the buck of the group. It's a complete package at the lowest price point.
The return policies are so good at this point that the Rex5 is worth trying. Given what people said, I bought them just to try them, thinking I would not keep them. Best laid plans of mice and men.