I purchase this unit a few day ago and so far I be really impressed with it . it do everything that it say it would do and do it in a way that a non-tech person like I can understand . I do some test run and I do not get a wrong turn once . even when I deliberately go off course it redirect I within a second or two to get I back on track . it truly be a plug and use item with very little setup or reading of instruction to do .