From a post I made on another site:
Just purchased the 465T. Seems to work as advertized.
We wanted it primarily to help with low bridges.
Our experiences so far:
Pro's
Has excellent truckDB
Allows setting up your rigs height, weight and width
Notifies when on "non-truck" or substandard roads
Has turn by turn e.g. text to speech
Screen is larger than standard small Nuvi
Allows route downloads
Cons
Speaker isn't great, maybe not loud enough
Voice is robotic (as in most/all Nuvi's with Turn by turn)
Is expensive $450-$500
For us, the comfort that we'll know when low bridges or narrow roads are on the route, make it worthwhile.
A good review is at:
Garmin nuvi 465T Truck GPS Review (GPSmagazine.com)
While on the subject, while researching GPS's, found a lot of interesting stuff.
-TTS editor, allows you to change what the GPS says in some cases;
So for example, you can change "recalculating" to say...."I'm lost...trying again" or whatever you'd like it to say.
-GPS gate allows SOME Garmin GPS based devices to be used with PC based products; for example, my Garmin, runners watch, Forerunner 205, can be connected with MS Streets and Roads for real time GPS tracking. Pretty cool.
Paul