DING DING DING DING!
(that's the alarm going off!!!!!)
I haven't heard of it being used by anyone I know
can't see any legitimate reviews for it - in the mags or trades - the site doesn't claim any awards or anyone recommending it.
My thought is - your ISP will be filtering spam as best they can - the crimms change tactics so quickly that it's impossible to avoid
(they are also constantly updating their database far better than SF will)
if you think you need spam filtering - I'd buy a security suite such as kaspersky - that way you get the whole deal - virus, mapware, spam, firewall - all integrated into a slick front end
but your best defence is a personal, business, legit subscriptions, dodgy subs, online buying
e-mail addresses -
you only use personal for friends/family
business - credit cards / bills
the others can be ditched when they get too annoying