I have a NUVI 1450LMT. My gripe is that for caches behind say a store, it wants to go into the neighborhood behind the store and then "go off road". With that said, I've learned to look at where it is sending me and check the main road to see if it is a retail location. If I set the unit to off-road navigation, it generally gets me to within 30 feet of GZ. Another dislike on this unit is it's propensity to freeze up. I use GSAK and the GPX-By-Cache-Type macro to load custom POI's to the unit. If there are too many caches in the "sensitivity notification distance" the unit freezes up. Third beef on POI's - why does it have to ask me EVERY TIME I TURN IT ON if I want to save the POI's on external media to the internal....
However, a new complaint. The lifetime traffic is apparently tied to the power cable on LMT units. In my case, the USB connector is breaking and keeps loosing power connection and I think it will be compeletely worthless in another week or two. I can't believe Garmin is charging $70 (US) for a replacement!!! And in my mind this problem is caused by poor engineering on their part. I've submitted a support request to Garmin and am waiting for a reply... I've been using Garmins since the GPS 3 days, this may be enough to get me to change vendors on my next unit.
SailorSam20500