I use the Garmin c330 the entire weekend throw different destination at it . there be one it do not have I just put in the cross street and it find it no problem . this gp be the Apple Macintosh of GPS Units . it just work , it pick up satellite extremely fast , it be simple to use , the windshield mount be probably one of the best I have use . I have not try out the `` detour '' feature yet but it will help when I be stick in construction or in traffic . the internal battery help when try to plan trip and setup favorite while not in you car . as for it not be user replaceable I be glad it be not . do not need to be . not a serious disadvantage . if you want a gp that just work without have to worry about the other `` geeky '' feature like see the satellite and thing . the Garmin c330 be the one to get . the speaker be loud and clear I like to have my radio pretty loud and I be still able to hear the c330 . the drawback be like everyone else have say , it be not good in direct sunlight but with the voice prompt it be not a big issue .