Every so often someone brings up gosolo. After reading their website you will see they are an answering service. An answering service that just takes messages and allows the business to chose whether or not to return the callers call. It has nothing in common with Go800.
Here is an example of one of their features:
Call Whisper - screen your callers. Call whisper feature tells you who is calling, and then you decide whether to take the call or send them to your enhanced voice mail system.