We are about to purchase a Trimble S6 and we have the option of getting a refurbished one for $19500 or a Demo that has Vision installed for $24,800. Has anyone used this Vision technology and do they think it is worth an extra 5K? From Trimble's website: The Trimble S6 Total Station with Trimble VISION™ technology enables surveyors to remotely see and measure through a live video feed from the instrument on their data controller. By integrating survey data with the live video surveyors can verify their work and ensure that they have captured everything before leaving the job. The calibrated camera allows users to easily integrate images into their survey workflows. Photo documentation also allows surveyors to complement the data they provide to clients with images of the job conditions and point attributes, making the data easier to understand.