Is Flexi Auth Secure and Reliable?

Hello,

I have been searching for a user management script for the last month, i bought 6 scripts from ...some... php market, but all where huge failures,
some used MD5 with no salt, some used mysql_query with no escape at all, the things i have seen in these scripts were scarier than horror movies, and they all claimed to be Fully Secured and Professional

I also tested many CI systems, they were good but some had BruteForce vulnerablity, some had other issues..

Best one i found yet is Flexi Auth, it has most of the requirements,

But i am not a Security Expert,

If there are any CI/Security Experts here, have you checked this library?

1. Is it fully secure against "SQL Injection", XSS, CSRF , Session/Cookie Attacks , BruteForce etc?
2. Is it reliable for large projects with a lot of users? (will it become too slow, i mean the logic programmer used on database/retreiving data) etc