when I purchase the iway 500 I wrongly think that it be the same as the i-way 350 only with a larger screen and more feature because it be the more expensive item . the screen size be excellent and its overall performance be very good . however it be too heavy and inconvenient to hold and bring back and forth from car to car and home . the fact that it do not have a battery also be inconvenient . the screen be bright and clear on both model . the auditory turn by turn direction with adjustable volume be also very good . another excellent feature be the automatic recalculate of direction should you choose to vary from the initially calculate route . in other word it accurately keep up with you give new direction from you most current position .