Panda Cloud Antivirus is Panda's successful attempt to jump on the free antivirus bandwagon. Along with MSE, it is an excellent choice for average users with a simple interface and completely automated features with automatic updating and removal of malware. The detection level is generally very high, but according to the latest test data, detection of zero day threats is slightly lower. PCA uses 'cloud' technology to provide for a much quicker release of updates as all definitions are stored in the cloud and thus the moment Panda updates their blacklist all users of PCA with an internet connection are protected from it. Panda Cloud Antivirus has a behavioural blocker and web protection, which will certainly increase your security. However as you can simply use one of the other free AV's with a separate behavioural blocker to achieve possibly even better protection, this is not necessarily an advantage. One minor reservation I have is that PCA seems to erroneously detect certain browser/system-related applications, for example VideoCacheView, and because of the automatic quarantine this made it a fraction bothersome.