I just watched a video testing Panda Dome (Free) against 1,000 malware samples, and it had a detection rate of 76%. I don't really like these tests where the guy uses a Python script to bombard the AV with one malware sample after another. But anyway, Panda had a detection rate of 76%, which is quite low compared to top-of-the-line security products that reach 99%. In the video, the guy showed that it was only consuming 46MB, including Panda's processes. It's super lightweight, but leaves something to be desired in terms of protection.