Me and the soup-dragon are all for them. Comfy, float, washable (even used sump oil!), no smell or stubbed toes.
Other colours are available....
Did have a 'blow-out' ascending a steep slope with sweaty feet, but have never been injured due to them.
I am not reknowned for sartorial elegance, and it's some years since I saw my feet, so WTF?