We have multiple Vonage lines at our business and it has worked out great. I would say that 99.5% of the time - you will not be able to tell the difference between a Vonage call and a regular landline.

We intend on continuing to use this service - especially for any employees who telecommute to work for us. The call logging feature of both inbound and outbound calls is a nice touch and naturally - you can't beat the cost effectiveness of the service.