Don,I asked an Apple Software Developer and a Computer Science student (my Son
) about your question.....
As far as reliable, u can download it from apples website. So that means they approve. Designed for security-conscious Mac users, MacScan 2.1 does two things: It scans your hard drive for spyware and other malware that has surreptitiously slipped onto your system and it cleans up the traces left behind by Web browsing—your browser history, cache, and cookies. But the question is: Do we really need a separate application to do either? Because macs already have stuff like this built in. That's why they are so secure. But it wouldn't hurt.