A:Answer Two devices in a row died for different reasons.
The first one worked for about 32 days and then the screen became noisy (it was filled with white and impossible to read).
It took four weeks for the company to receive my broken device and to sent me a replacement.
The replacement died even quicker.
After my first swim, it became warm and glitchy and then switched off completely and stopped charging. Now it's dead too and FitBit seemingly does not want to fulfill their warranty obligations.
Here's their answer:
"In this case, let me inform you that this scenario needs to be reviewed by an Ionic specialist before we can replace it. If allow me to do so, I will go ahead and assign this case to them and we will contact you back very shortly."
So, I would not recommend swimming.