Ordered a PAP2T from Amazon on Saturday, with standard shipping it arrived on Tuesday - apparently there is an Amazon warehouse just over the MA/NH border.
Upgraded the firmware, painless as long as you know the IP which can be gotten via phone. Getting the IP via phone is about all the Linksys manual is good for. I pulled the IP from my router's DHCP client list.
Configuring the PAP2T isn't simple, there are many many options, the vast majority of which can be ignored. The more important setting are under Line1 or 2 and Mark has posted a PDF of his settings in the voip.ms discussion forum linked above.

voip.ms is very advanced user friendly, lots of things to play with and tweak, unlike Lingo - this is both good and bad, but I'm finding it interesting to peak into.
I do like that I can select Premium or Basic call quality and cost settings independently for International and USA/Canada calls, as Premium quality calls to Irish landlines are actually cheaper then Basic quality.

Will have to get SWMBO to make some calls to see how it sounds to her before porting our number - unfortunately we only have one handset in the house, so it may be a while before we fully move over.

Yup, I know I am a lucky bugger to have FIOS. We've had it for the past 3 years, I think our town was a test town. We get solid 3mbit down and 700kbit up.
I did tracert to their four servers. While NY is geographically and one hop closer, I was getting timeouts on the 9th of 11 hops. So I went with their us1 server.