I have MJ and it's OK, not great. I had a lot of trouble at first getting it up & runing, but subsequent installs have been fine, so I assume it was a hiccupw ith the original computer. I did get it sorted out & use it on the origial machine.
I would'nt give up my landline for MJ,a nd if I was making an important business call, I would use landline over MJ. It can be flakey & dropped calls etc. CAll quality is OK, not great. I sort of say its like lower bit rate MP3 vs Original CD quality sound.
Support is all chat based and not that great IMO, no telephone contact available at all, everything is chat based.
Its a great way for me to talk to freinds etc long distance without the cost. when I travelled to Ottawa this past summer, I was able to keep in contact with home at basically no cost.
not all telephones work with MJ, although most that I have tried do . thenolder telephones with the bell ringers wont as they require more power than the newer electronic ones .
There is a forum here worth reading ( if you can decpher some of the posts LOL)
http://www.arnab.ca/site/2008/07/21/magic-jack-toronto-canada/
there is an ongoing discussion re CDN numbers, the site claimes to have CDN numbers, but theres no way to choose a number, not sure about that. I don't have an issue with the US number, so it's not a concern to me at this time.
Overall, for the initial cost of $39 for the MJ plus 1 yr of service, and $20 for each year after that its a bargain IMO.