Most illustrators I know are using a combination of an iMac and Wacom tablet. If it is an agency, they'll possibly be using a Wacom Cintiq, which approaches $2,800. The cost of a Surface Studio is not out of the ordinary. https://us-store.wacom.com/Catalog/Pen-Displays/Cintiq/Cinti...

The sentiment on Designer News was positive, and most of the people over there are UI designers and front-end engineers. https://www.designernews.co/stories/75964-microsoft-surface-...