I got a new Prius two weeks ago tomorrow and this week got a new 3597 for it. The Toyota gps isn't "all that". I had a 3790 prior to that. The 3597 has a sharper looking screen it seems like. I'm still getting used to it but I like it so far. I love the car. Getting over 50mpg almost everywhere I go is pretty cool.
You are probably seeing things "sharper" on the 3597 because the screen is bigger. The 3790's screen is 4.3" diag. while the 3597 is 5". Other than that they are pretty much the same (both 800 x 480 resolution, both dual orientation glass, for example).
The 3790 is a nice GPS but a bit of a strange beast and I'm sure you'll really like the 3597, which IMO is the best automotive GPS Garmin has ever offered.
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