I hear you, but in actually fact I have been a ZA client longer than an avast! client and I have no gripes about ZA, not ZA Free which I started with many, many years ago, not ZA Pro which I have been using for a year now. Upgrading to ZA Extreme I'm sure, will suit my needs as I have nothing but praise for ZA products.
I won't close the door on avast!. One never knows when I may need this great anti virus product, but for now, it is not compatible with ZA Extreme and I honestly don't have any worries.