Thanks for your comments.
Many of the VoIP issues are handled by the broadband phone service providers, so the struggle isn't the same as for enterprise VoIP. You don't, for instance, need a routable IP address for your voice device because the router works with NAT to make the connection (consumer VoIP, not "real" VoIP).
Pricing varies widely, but I chose the more common $20 range rather than the $10-17 range still possible in some locations. National POTS pricing varies, but broadband phone pricing doesn't, making it a tough comparison at times.
I have pushed VoIP, er, broadband phones on non-techies with good success. I wouldn't push them to get a SIPphone or FreeWorldDialup account, but Vonage aims exactly at non-techies and does a decent job.