I have worn the 5811 for 2 days and here are some initial feedback:
The adjustment on the bracelet is very useful and I use it all the time. I sized this bracelet with no allowance in an aircon environment (as I'm aware I have a few mm to loosen if needed) and my wrist expands outdoor, after meals and exercise.
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A few members have asked about the difference in hue between the 5811 and 5740. Below are 2 side-by-side pics. As you can see, the 5811 is a darker blue while the 5740 is noticeably lighter.
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Wearing wise, the 5811 is substantially heavier than the 5711/1A but if sized properly it will not be an issue. I like both iterations and am thankful I got both. Have a great Sunday everyone!