Great, that was my initial feeling, it was a free font that I used it for. It's a family of fonts sans serif. Introducing Opinion Pro Font Family! Opinion Pro designed by Mint Type. Opinion Pro is a geometric grotesque sans-serif typeface with extra-large x-height that comes in 64 styles. It is composed of 4 width variations, each in 8 weights with respective italics. Its rigid curves with pronounced vertical stems makes it useful as both display and paragraph typefaces. Also it works particularly well as a typeface for technical applications such as wayfinding or labeling of any kind.
Thanks to Mint Type. This is the demo version, only 8 styles. Opinion Pro free for personal use. Please visit his store for more other products, and buying fonts support him.
More link: http://www.myfonts.com/fonts/konstantynov/opinion-pro/
This fonts are authors' property, and are either shareware, demo versions or public domain. The licence mentioned above the download button is just an indication. Please look at the readme-files in the archives or check the indicated author's website for details, and contact him if in doubt. If no author/licence is indicated that's because we don't have information, that doesn't mean it's free.