I have never used Dr. Web products and today came across the name in a site when searching for anti-spyware. Though, in this forum itself, I have already asked whether to use any secondary AV along with ESET Internet Security, and getting recommendation as NO. I tried: Panda Dome with ESET. No conflicts. No performance impact. Malware Bytes with ESET. No conflicts. No performance impact. Today, I came across Dr. Web KATANA. When checking the details on Dr. Web site, it mentions clearly that it is a non-conflict tool which can be used along side primary AV like ESET. It also mentions that it uses signature-less technologies. I want to know if anyone tried KATANA and how effective are the signature-less tech it mentions? Has anyone tried it with ESET IS?