The Bat! is completely safe, according to FileCluster
The Bat! Professional Edition has been downloaded and scanned by FileCluster on Feb 1, 2011 with a 4-in-1 antivirus security solution, composed by: BitDefender Antivirus Pro, NOD32, Avira Antivirus and Kaspersky Antivirus. The Bat! Professional Edition was found clean from any forms of viruses, spyware or malware, making it safe to install on any system. For improved security, The Bat! Professional Edition will be retested with every version update.