This plugin is absolutly the best

After trying many plugins, with this I managed to correctly export / import all users.

I was able to correctly export also the related passwords, including the complex ones with special characters. To export the passwords you have first to remove the encryption block of wp, to do so enter the following function in functions.php:

add_filter(‘pp_eu_exclude_data’, ‘my_include_password’);

function my_include_password() {
return array();
}