my parents and my brother each have garmin nuvis.
my parents have the nicest one available a few months ago, and my brother has a low end one from christmas.
they all love them and have had no issues, and use them all the time.
depends on your use:
my brother only uses his a few times a month, and his works great for that.
my mom spends 4 or 5 days a week living on the road, so it was a no brainer for her to get the more feature ridden model.