It has been working well for me so far. Updates every 1-2 days. I don't want to pass along Windows viruses to others or to my Mac partition, and Mac malware, although nascent, is unfortunately growing. This does the trick without much hassle, and the price is right! So far, I much prefer it to ClamxAV, which was too slow and crashed too much for me. ClamxAV worked well for a year or so, but ever since OS X10,5,5m ClamxAV Sentry would crash multiple times per day. Only one crash of McAfee so far . . .