I've seen the adds for MagicJack, something just seems "shady" about this setup.
If you want a good internet phone, I'd look at Vonage first.
I've used skype for at least 3 years. Good voice quality, and it does have several nice features.
But I don't use it to replace my phone, I have a landline & DSL so no advantage for me there, however skype can still be pretty handy.
A being able to control who is in your contact list, who can call you, send you message etc.
B being able to send someone text/url in chat can be very very handy, especially when your walking a squadie though a computer problem.
C Being able to send someone a file, be it a picture, or something larger.
D Being able to tell when my buddy's are online and likely to be flying.
(a quick text message will usually even tell me what arena)
E Tis free (and being on a very tight budget free is good)
F Latest version (running a beta version right now) is feature packed and stable.
G Skype will also work as a alternative to AH Vox, although trying to use both may have some sound quality issues.
I'm currently running version 4.0.0.176 and very happy with it.
If you want into my skype list email me, and I'll consider it.