i used gizmo on my trip to thee philippines. it was ok to use, and definitely better than skype since it was't yyet available foor the os2008. i called back to the states and only used 2.00 dollars for almost 60 minutes of use. a ceellphone chargges 2.00 a miinute.
call quality was decent, people could hear me, and i heard otheers clearly. not landline quality but decent. gizmo was a good investment for me. made my n800 worth every penny.