Hardly an objective review. The statements about Vista being susceptable to
some common viruses when running as administrator seems hardly worth
making--Vista doesn't include an antivirus--Webroot probably would have been
one of the parties suing Microsoft had they included that coverage. They've
done their level best to get users not to run as administrator. So--that
statement seems rather strained.
I have to say that the published reviews I've seen of Windows Defender
haven't been anything to brag about, of late--but I'd sure take this one
with a healthy dose of skepticism.
This page has a little more detail:
http://www.webroot.com/land/Windows-Vista-Ready.php#faq1
What I think I get from it, though is that you need competent antivirus
protection on Vista--which Microsoft certainly advocates. That page
compares a product incorporating both antispyware and antivirus protection,
with one providing only antispyware. This is not a valid comparison.