Clay,
A friend of mine got one for his wife, she sells Mary Kay stuff and is on the road alot. I think he looked at the TomTom and Garmin. One of them would not tell you that there was a turn comeing up in a 1/4 mile or anything. It just told you that you needed to turn with no warning at all. I am not sure which one it is but I'll ask him for you tomorrow and get back to you. Maybe someone else knows for sure.
"If we lie to the government, it's called a felony, when they lie to us, it's called politics." Bill Murray