probably should get the program, it's better than norton or mcaffee thats 4sure! :)
I don't think you'll regret it.
As far as other features of Avast!, I've always thought the IM & P2P shields would be helpful for people with kids, who seem to like those things.
(For those not familiar with Avast!, you simply select the "shields" you need at installation.)
Also, as far as support, their forum is very helpful. IIRC A member of Alwil (Avast!) answers questions there.