Let me start by saying, I was skeptical about this smart ring at first. Coming from more expensive fitness trackers, I didn't expect much from the Amwentu. But boy, was I wrong!

The first thing you'll notice is how lightweight it is. I literally forgot I was wearing it after the first hour. Unlike some chunky smartwatches, this sits comfortably on your finger all day without any irritation.

Sleep tracking is where this little gadget shines. As someone who's struggled with insomnia, seeing my sleep patterns broken down into deep/light/REM cycles was eye-opening. The app shows you clear graphs of when you tossed and turned - though sometimes its blunt assessments ('You are in a bad state') made me laugh out loud!

For daily activity tracking, it's surprisingly accurate compared to my friend's Samsung watch during our morning runs. The step count matched within about 3% difference - more than good enough for casual fitness tracking.

Now for the not-so-great: The blood oxygen readings seem off by about 10% based on medical oximeter comparisons. If precise SpO2 monitoring is crucial for you (like for high-altitude athletes), this might not be your best bet.

The charging case is a lifesaver though! I charged it fully before a 5-day trip and didn't need to worry about power at all. The magnetic charger is finicky but charges incredibly fast - about 30 minutes for a full charge that lasts nearly a week.

Final verdict? For under $100, you're getting 90% of what premium smart rings offer without subscription fees. Just don't take its medical readings as gospel truth!