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Full user review
"second best free scanner"
-good detection and removal rates
-tried and tested, trusted software
-may crash on older systems
MBAM is a good to have scanner on the system particularly if you're using free AVs.
If you're scanning with Malwarebytes, it's advisable to be off the internet a while, disable your proactive AV temporarily as the AV intrudes upon MBAM 's detection.
The paid version works well with most AVs as a second line of real-time defense and it's not too expensive.
In my opinion, Emsisoft anti-malware free version exceeds malwarebytes in scanning speeds. Emsisoft's detection and removal rates far exceed anything out there, free at least. The drawback is that Emsisoft does have slightly higher false positives than MBAM but lower than Comodo cleaning essentials. Emsisoft's detection is lauded by industry experts consistently having 98% or better detection rate. it saved me lots of headaches.
I am not pushing any product but I know the headaches everyone feels, the valuable time wasted on fixing infected systems, reformatting so i am merely offering my opinion.