I have a Garmin 465 LMT. If it has one glaring fault, it would have to be that it is incapable of re-routing around traffic jams. It's addicted to the notion that the only acceptable route is the Interstate, even when two semis and three cars have got into an accident that completely closes the Interstate for hours.
Example: A few weeks back, the very thing I just mentioned: Huge accident, Northbound lanes of I-65 at Rensellar, Indiana. I was headed from London, Ohio to the Chicago area. Look at the map on your trusty road atlas, and you can see that getting off at US 52 and taking that North gets you around the problem. Garmin can't see that, it fought me the whole time because it wanted to head for the traffic jam.
Today: I had a run from Elk Grove Village to Salem, Illinois. There is construction on Interstate 57 at Bourbonais that is making a royal mess of things, and the backups get fierce because of squeezing down to one lane. The smart thing to do is to get off at exit #322, go west to US 45/52 and take that South through Kankakee to Rte 17, then jog down-- staying on 45/52-- and enter Interstate 57 again at the 308 mile marker. Think Garmin can figure that out??? Not a chance. After several "reroute" attempts--- it knew about the heavy traffic from the moment I left Elk Grove-- it tried its best to get stuck in the traffic jam. Even after I manually re-routed, Garmin fought me because it wanted to get back to the traffic jam.
This thing has a warning system that is supposed to help it re-route around heavy traffic, and so far I am massively unimpressed with it.