I've used Avast. I tried AVX once before Avast aquired it, and found it rendered internet access unusable with no fixes found. I still use Avast, even though it is owned now by the evil Norton empire. Yes, I used to use Norton way back in the dark ages, and paid the required annual subscription fee, and I found one day when I tried to do some work that 75% of my cpu cycles were in-use by Norton anti virus. On that day, I went shopping for alternatives. My next one was not Avast, but something else...I forget....and it lasted until I found it chewing up all my cpu cycles, and that's when I went to Avast, ever mindful that I was dealing with a product from an ex-Soviet contry.