We also had someone on one of the other threads saying that he does not trust MSE for him to use his banking details on it but has another computer without MSE that he uses for that. Only his opinion mind you and it may be perfectly safe. I have not used it so cannot comment on it.
MSE does not have a Firewall but relies on the Windows Firewall unless you install another program. Personally I wouldn't rely on Windows Firewall for on-line banking. Otherwise I think that MSE is one of the best of the free programs. I have a laptop which has Norton 360 on it which is coming to the end of its subscription and I am seriously thinking of replacing it with MSE.
If by any chance you have the Pro version of SAS, it will not run at the same time as the pro version of Malwarebytes, they conflict. The free versions are OK because they don't provide real time protection.
After advice here I use freebies - Avira, PC Tools and Malawarebytes. I found problems with the free version of SAS with 64 Bit W7. It ran apparently ok but eventviewer reported many problems, so I have uninstalled it for now. Google shows others with same issue
You'll probably find that no one has tried more than a couple of current products (other than review sites) and so it is difficult to get a good overall view.
I started off with AVG, but seriously went off it when they introduced version 8. I looked around and tossed up between Avira and Avast. Can't remember why now, but went for Avast. The user interface in the old version (4.8) was a bit naff but otherwise good. The new V5 has a much cleaner user interface. It seems pretty light on resources and as far as I am aware does a pretty good job of detection.