Pretty reliable anti-virus and firewall. Among the best there is for pr0n viewing (Along with McAfee's Site Advisor which tells you if a site's safe or been found to be bad). Coupled with Malware Bytes and Hijack This! it leaves your computer pretty safe. Also not a resource whore. I ran this on my 7 year old computer and there was no lag like there was with other firewalls. However, it isn't the holy grail either. Like with all other anti-viruses, have everything backed up and another around just in case.
Nod32 has saved my life a lot of times. I'm never touching Frostwire again!