Does what it says on the tin, great!
One suggestion, which is directed at developers using this plugin rather than the plugin developer. Make sure you let the user know what your password requirements are BEFORE they attempt to set their password. There is nothing more frustrating than trying to submit a form and being told "your password needs at least one number" and then submitting again and getting "your password needs at least one special character"... not the best user experience and I would imagine it would have a negative impact on the purchasing process.
In Woocommerce you can change the password notice quite easily via the template (woocommerce->checkout->form-billing.php around line 49), just make sure you copy the template into your own themes folder.
in checkout page the password strong validation not work.
No problem during my test with this plugin.
I installed it and when someone tried to register, they got
"Fatal error: Call to a member function get_error_code() on a non-object in /home/domain/public_html/wp-content/plugins/woocommerce/woocommerce-functions.php on line 777"
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