They have a great 30 day guarantee...that means you'd could try VoIP for free.

Here's the full guarantee:

Your Money-Back Guarantee 30 Day Money Back Guarantee on all Packet8 Service Plans If you are unsatisfied with your Packet8 residential service for any reason in the first 30 days after signing up and have not used more than 300 minutes of calling time, you can cancel for a full refund of fees paid (activation fee + first month's service). Shipping and handling charges are not refundable. Monthly service plans and minutes of use on metered plans are not refundable for business plans, though equipment fees and activation fees are refundable. You will be responsible for any international per-minute charges (calls to non-Packet8 telephone numbers outside the United States and Canada) incurred during the 30-day period. All we ask is that you call customer support to obtain a Returned Material Authorization number at 888.898.8733 and send the equipment back to us in good working order. Once we receive the equipment, we will issue a credit to your credit card. **Calls to mobile phones, premium, special, and information service numbers are not included in the unlimited international destinations. US includes PR, USVI and GUAM.

To check Packet8's website for updates on their guarantee click here.