>(swbell claims to monitor their network carefully, ha!).
by monitor they probably mean that they cut off certain ports (I don't remember which) but it helps in protecting you in case of internal hacking.
I'm quite sure they have better things todo than to sniff what goes in and out of your bandwidth.
As for the free software, it may be free but simple, effective and trustworthy are what is questionable. It just depends in which camp you sit and which you trust.