I’ve used Avast Home and AVG Free (at home) and AVG Pro and CA EZAntivirus commercially.

My experience with AVG support…

AVG Pro - by email - excellent

AVG Free - by volunteer forum - helpful, but sometimes begrudgingly so (BUT - it’s still better than the appalling email or hidden on-line support for CA EZAntivirus- which is not a free program!)

Problems with AVG for some users seem to have increased since the introduction of version 7.5. This was also the case when 7.0 was first released. Hopefully there will not be similar issues for Avast in future.