Fair comment. One must not look a gift horse in the mouth. Avast! is a good product which coexists with other security software very well. AVG 8 Free seems not to be free of operational problems which is why I have ceased to use AVG.
In addition to Avast! 4.8, I use Agnitum Outpost 4, Threatfire 3.5.0, Spybot - Search and Destroy 1.5.2, Spyware Blaster 4, Spyware Doctor 4.1.
Avast does seem to be kind to Windows installations. One would hope that Avast! looks at the slightly mysterious aspects of this product. Some options are not very obvious.