Diatone.us is considered a legitimate website. It is the official site for Diatone Innovations, a professional and innovative manufacturer of FPV/VR device equipment. The site offers a range of products including FPV drones, RC frame molded parts, flight controllers, ESCs, and RC motors. Many users have reported positive experiences with their purchases, and the site is known for its quality products and reliable service. However, as with any online purchase, it is always recommended to check for the latest reviews and ensure the site is up-to-date.