I have just recently recieved a boot degradation error on the mbam service at startup. The degrade was 14 seconds at startup, so I am going to try and delay the mbam startup as there is a setting for that in their dashboard. Other than that no performance hits.
I just wanted to point out that i reset the MBAM protection to delay for 15 seconds at startup. The setting is in "Advanced Settings" and it is defaulted at 15 seconds so that is where i left it. I completely shutddown my laptop and then booted and the startup was 38 seconds in Event Viewer Boot times. No degrade.