I have just been provisioned with VFX (yesterday). Sound quality seems quite good although a friend that called my wife asked were she was as it sounded "hollow". That was without the caller having any idea that she was connected to the IP phone line. I am happy so far though as I expected a slight drop in voice quality and the features it offers leave Telstra’s voice services in the dust. At last the message light on our phone works!!.

So my question with the hardware and broadband plan I have and the sometimes large downloads I do is it worth setting up QoS? And if so is there a guide somewhere on what to set for VFX?

details
Telstra HighSpeed 20G 4 Mbps downstream / 2 Mbps upstream cable internet (Wainui, Wellington)
Linksys WRT54GL router running Tomato firmware
Linksys PAP2T

I do download large files and at times use bittorrent.