Glophone has Glo2Go Express, excellent sound quality, free peer-to-peer, and an instant message feature is now in beta testing. Buddy list and directory is a built-in feature.
The user may need to install the regular glophone to sign up for an account, but Glo2Go will replace the regular Glophone. The "Bluephone" is free.
There is virtually no configuration with Glophone. Xlite can be difficult (there is a config bug in some downloads).