It's clear from the pictures that it has been used once, with temperature control and rotation speed adjustment. Its design looks kind of tilted to provide an excellent grinding performance for coffee beans. You can even control the roasting level - light, dark or medium - resulting in excellent roasting. It doesn't have a glass cover. You can try it out and see for yourself. The price is reasonable for a new one. As shown, it has S-shaped grooves that distribute heat evenly.