@ twl845
In the same way it isn't recommended to have two resident AVs, the same is probably correct for two resident anti-spy/malware applications.
So If you have SAS Pro (resident) use MBAM as the free option as an on-demand scanner.
@ YoKenny
If you didn't use SAS Pro with its resident protection, how would you know if it could stop malware being installed or not, short answer is you can't. In the same way I can't say the MBAM can't stop malware from installing as I don't have the resident options only on-demand.