Provides pure spyware/malware detection and removal without redundant antivirus objectives
If you just want a second line of defense for sub-critical infections, this will do exactly that without trying to second guess your antivirus software as well.
Bad at removing found malware, especially rootkits
In a test performed by PCMag over half of malware that the tool attempted to remove was still running after the attempted cleanup. Rootkit removal often crashes other software.