Legit? Yes
Get rid of your landline phone for majic jack? NO
I have one, it's a great inexpensive tool to make long distance calls with no charges within North America ($20 per yr for the service, unlimited calls)
IT does have its problems tho, a it flakey, sometimes get cut off, intermittent service etc. Also , from what I've read, stay with the US number, dont go throught the resellers & get a Canadina number at this time,,,
there's a discussion forum here that you can check out
http://www.arnab.ca/site/2008/07/21/magic-jack-toronto-canada/