Summary: This is my first GPS system so I did a lot of research online before I went ahead purchase it in March 2007. I wanted a large screen one and traffic system. 4500 seems to be the perfect match.
Pro: large screen, real-time traffic system saved me many times, and reasonable routing suggestions. I don't have the rerouting adaptation problem as the other reviewers and if I get into a side road, it'll recalculate immediately.
Summary: I got the unit for Christmas, attracted to the good display, but leery of the reliability, both due to other's reviews. I have no serious references to other GPS units, aside from one in an ACRUA MDX that was built into the console, and was very impressive. My 4500 is away to be repaired now, they say for about 3 weeks, with very little use when it worked. I was careful with it as was possible and used it only on major highway trips.
Summary: The unit is very large and bulky. It does have a very large viewable map which is nice. The unit I had worked about 1 week then would not power up. I am completely dissapointed with this brand and unit and am trying another one.
Summary: I am very pleased with this GPS unit. I was alittle worried after reading some of the reviews, but am very happy that I still ordered it.
The graphics are by far one of the best. It has very detailed graphics, unlike many of the other brands that have a more cartoon look to them. The graphics are compariable to what you would find in a in-dash unit. It is very user friendly, and easy to navigate.