Avast antivirus is very popular antivirus infact it stands ib the list of top 10 antivirus but it does not fulfil the exoectations of users around all over the world.
Avast has a very weak abtivirus even even the avast abtivirus is got infected by virus in my laptop. Avast produces a pop-up box every time if it is not uodated which is very irritating thing ever. Most of the antivirus I have used did not show such kind of pop-up box to update the antivirus.
Even avast did not offer good features in comparison to it's competitors. It has very limited services.
My personal expectation is not fulfilled by avast. It's upto you , you can give it a try if you want to.