How do the pros use Google voice?

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http://androidforums.com – I've been itching for some time now to use Google voice. But, frankly, I'm at a loss to completely understand how it can enhance my mobile experience. So, I'd like to put a question out to all the experienced Google voice users out there - how do you use Google voice? What is the best use for it? What will I be missing out on if I don't have Google voice and Hangouts on Android finally updates to include Google voice (for that matter, why is that such a big deal?) Thanks everyone! (General)