A free service deserves a lot of forgiveness because it is FREE, but every product manager knows about market requirements that are check-box items, ones that the target audience thinks are 'givens,' that if not delivered, the whole product or service gets bad-mouthed. One such check-box item for any voice-based product is voice quality.
Ideally, one spends resources to cover the minimum set of check-box items to a 'no objections' level, but really invests in honing the differentiating features to make them better than customers expected. A successful marketing slogan that some vendor has promoted was "delight the customer".
Google Voice's voice quality is not good. There are drop-outs, echos... probably those packets were assigned low priority in the network. That is not good for a voice-based product.
On the positive side of the balance sheet, what differentiating factors does Google Voice have that might compensate for poor voice quality?
- FREE service. That pricing structure is becoming a check-box item. Google has made 'free' an intrinsic part of their brand and have driven most B2C web application to follow.
- Users can choose their own phone number from a set of numbers. Google doesn't make it easy but it's worth the effort. Most people use a monthly flat fee for national calls so 'local area codes' are less of a differentiating benefit than they used to be.
- Integration with other Google services such as delivery of message notices to your mail box, not only your Gmail mail box. This is a win-win for the user and for Google. It's called cross-marketing where products help each other.
- Voice to text -- The accuracy is not great but the benefit is users can access voicemails with email. If I miss a crucial word or two, I don't have to linearly hear the whole audio message from the beginning to try to catch the words I missed. The added benefit is I have a written version that is editable and shareable.
- An unusual feature is Google Voice announces callers and users must click a key to accept the call. Not very effective in screening spam calls, but they must consider users with no visual caller ID capability.
- The feature I like best is the ability to put the "Call Me" icon on any web presence where I can add HTML. That feature increases my customer intimacy. My readers can interact with my content by adding text comments or talk to me for free by using Google Voice.