From: Randall Parker 

They liked Symantec's overall. But they also complained of pop-ups (which I
thoroughly hate):

Symantec's suite seemed to talk the most, regularly popping up software status alerts
and cookie warnings.

http://www.pcworld.com/reviews/article/0,aid,125817,pg,1,00.asp

We contracted with German research company AV-Test.org, which threw more than 174,000
worms, viruses, back-door programs, bots (aka zombies), spyware components, Trojan
horses, and adware samples at each suite. In addition, AV-Test.org analyzed each
suite's heuristics (its ability to detect as-yet-unidentified malware), as well as
each firewall. We also checked how fast each could perform a full security sweep of
our test system and how much running it slowed down our apps in our
WorldBench 5 tests.

Though our testing was extensive, we didn't fully evaluate behavior-based detection.
The Microsoft, Panda, and Zone Labs suites offer this technology, which can identify
a new threat by the actions it takes (for example, if a program tries to
make suspicious Registry changes). This feature can offer a viable
supplement to signature-based detection, but testing it thoroughly proved
too unwieldy for this review.

--- BBBS/NT v4.01 Flag-5