"Don't think about leaving them..."1.5 starson by costas
Pros: Web features
Cons: Low call quality; overcharging you when disconnecting service
Summary: Contrary to CNET's review, their voice quality is low.
There is also echo, which their FAQ attributes to not using Panasonic phones (I was using a Panasonic device).
Even if you are unlucky the previous user of your new phone number to have been a "popular" person they will not change your assigned phone number, in which case prepare for several late night disturbing phone calls.
I was with them for two months yet still they were not able to switch my SBC number to Vonage.
Once I decided to cut my loses and disconnected, they overcharged me (they even took back a discounted month they had already offered).
I wish I had never joined them.