I purchase the 350 nuvus after much research , include reading review . I just take a 2400 mile trip across the US , include Yellowstone and other site out west . the nuvus be only inaccurate a couple of time and that be when I take what appear to be newly open road . it be definitely useful , but you also need to pay attention to the road sign . I especially love that nuvus give warning about upcome turn and advance warning when you need to be in the right or left lane before a turn . we have start use the nuvus for geocach and it have be right on ! it be also useful when arrive to a destination early -- I be able to look up hotel further down the road and make a new reservation ! what a timesaver . I will not travel without it again !