buy this product for a 2200 mile trip . get it two day before start and find it extremely easy to set up and learn . still learn some area such as map correction . recommend buy the unit with the traffic and life time map . deliver be as state . product work right out of the box . all the part be there . as far as use , I purchase this unit for the map update , screen size and the lane direction . it be very helpful in large city where be in the right lane to exit or join another freeway be in play . I have not use the map correction update yet , but it look like it would be very helpful . the speak dirction be very well do and allow you to choose from several different voice . I highly recommend this product and Amazon .