Updated Review:I initially gave it a 4 Star rating but just changed it to 5 Stars. I was having difficulty with viewing the daily rating of my Oxygen while sleeping. Some times it would register, other times it would not. I finally discovered that it was measuring my O2 level all the time. The results does not show up right away as you have to wait for a short time to appear.It did show me an upward trend in my temperature, resting heart rate, temperature variability with a downward trend in my Heart Rate Variability (HRV) when I came down with a nasty cold. I could trace it to the date it started.Original Review:The watch is pretty stylish. Comparing it to my sister's huge Samsung watch, this watch is sleeker and filled with more health features than hers.For accuracy, it is pretty good, but not perfect. I walked exactly 100 steps by counting them out, and the Sense showed 102. I'm pretty impressed with that. The sleep feature seems accurate when it measures the time fell asleep until the time I woke up. Even though it may not be totally accurate against more accurate medical-grade devices, it does give me a baseline and I can measure my progress from that. The heartbeat rate is pretty much on target but I haven’t tested it above 120 where some people have issues with it being accurate.What I find inaccurate: 1) the stairs counter. It misses counting about 4 out of 5 times. If I go down the stairs to the main floor and then back up again, I count 32 steps. 2) I find the SpO2 function pretty useless. First, it is not anywhere close when compared with two actual SpO2 devices. Secondly, sometimes it records while sleeping and other nights it fails to record for no known reason. There are a number of similar complaints and frustration on the Fitbit forum about this same problem. Also, you must use their clock face to record, which I find inconvenient. So, if you are thinking about getting this watch primarily for that feature, I would caution you.Other than that complaint, the watch is quite nice. The charging device is genius, you bring it near the watch, and it instantly connects. Charging times are very short, so that's a big plus. If you use it to record your sleep and then throughout the day, you might get 2 to 3 days between charges.Nice to have the texting and phone calls feature. Sometimes when I have my phone on vibrate only, I miss the call, but now with the Sense, I feel the vibration on my wrist notifying me of who it is. I can read a partial window of the text message too. When my phone is not on vibrate, I can text the person back through the voice feature. I can answer the call and talk to them through my watch; however, you have to hold the phone near your ear to hear them as the speaker is pretty weak.There is a learning curve if you are a first-time Fitbit user. This is true with the watch and with the App. The App is filled with many graphs and features. It will take some time to learn where they all are located, but eventually you will be able to navigate and find them. Speaking of navigation, if you swipe down on the watch to delve deeper into an app, you can swipe back up, but you cannot go back to the previous feature or forward to the next. You must press the button to go back home first where you must start your navigation over. I hope Fitbit improves upon this feature in the future.The silicone watch band was quite difficult to clasp and unclasp. It wasn't the most comfortable either, possibly because my wrist was in between the sizing holes. The nice feature of the band is that it only takes a couple of seconds to change them out. I purchased a nice elastic one-piece band that allows me to take the watch off and put it back on within 2 to 3 seconds. Here is the Amazon link: https://www.amazon.com/gp/product/B08KFFSHBH/ref=ppx_yo_dt_b_asin_title_o02_s00?ie=UTF8&th=1&psc=1 and there are two sizes. I do recommend this band as it comes in a variety of colors and patterns.So, in conclusion, would I recommend this watch? I would say yes as long as you are not needing it for the SpO2 feature which I find unreliable.