Great product. I have 3 busy inbound call lines at my business, regular land lines not on Majik Jack. I connected one Majik Jack to one of our computers, plugged in an additional set of 3 wireless phones the one Majik Jack. The main "Majik Jack" phone base is connected to the Majik Jack at computer station #3. The other 2 wireless phones are a stations 1 and 2. We use the Majik Jack to make outbound calls so we do not tie up our incoming call lines that our customers call in on. Of course we can only use one Majik Jack connected phone at a time because they are all on one Majik Jack. Just like you would do at home if you were to buy a set of 3 cordless phones and run them off of on wall jack. Reduced my phone bill/s by around $25 - $40 per month. I believe I got the 2 year plan and will gladly renew when due.
Caveats are not difficult to deal with.
A. Clear you cookies and cache to prevent garbling sounds when you computer runs low on memory which has only happened once since we maintain our computers regularly.
B. Drag the Majik Jack window to the far bottom right corner where it is barely visible (mostly off the screen) so when it pops up each and every time you use it it is out of the way and not bothersome.
C. Can't use it for a fax machine but so what.
I can't think of any other issues or complaints and been using it every work day for well over a year now.
Bought a second one for the house a few months ago. We'll use call farwarding from our main business land line and forward it to the home Majik Jack so my wife can take calls at home and not have to be at our business. This leaves her cell phone available for personal calls without interupting business.
Like I said, Great little gadget. My dad told me about it and had been using it for over a year himself without issues.

Does the noise in your head bother me ?