Exceptionally Unique
When I first heard mentions of google voice, I thought it was just a redundant messaging app by google (along side hangouts, allo, and duo). After I spend some time with it, it is in fact quite useful. Unlike other apps that are limited to only people who are using the same app, it works with anyone with a phone or anything with SMS capabilities. Unlike other apps (like duo) that does support SMS, you are able to choose your own phone number and your friends are just getting a text from who knows what.
I have read reviews mentioning of a glitchy, slow interface, but with my short time with it it worked almost perfectly of my iPhone 5.
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Google Voice, v2.5