I have the luxe because everything else is too big for me and it is perfect. The bracelets could also be replaced. However, this was not necessary. (approx. 17 cm circumference. Possible up to 15)
More advanced sleep analysis. Different workout programmes. As far as I'm concerned, the PREMIUM functions are useless ;) There's enough information in the standard version.
Yes, I have the heart rate in real time, with or without sport. This is the plus point of this Fitbit Luxe like the Alta HR. I could not measure with other heart rate monitors.
A special charging cable is supplied. A charger is not included, but any USB charger can be used, e.g. the one from the mobile phone. It can also be charged on a USB port of the computer.
The strap of the Fitbit Luxe comes with two straps of different lengths, i.e. 1x the side with the pin buckle and 2x the side with the holes for the pin - short and long. The so-called "hole band" also has a lot of holes in the short version, so it should also fit a very narrow wrist.
De Lux also measures sleep phases and displays them like the Charge 3 (some Fitbit comparison). But I would rather recommend the Charge series if looks are not your most important criterion.