Instruct: Classify the given Amazon review into positive or negative sentiment.
Query: Great Unit

This is my first GPS unit. I have not had a problem with the mounting unit as I have it mounted so that the unit rests on the dash. Since it also came with a remote, I am able to program it without leaning over to the unit. I used it in San Francisco the other day and it did a fantastic job around the tall buildings. The bluetooth phone interface with the external microphone is an excellent feature. If you don't use the external microphone it sounds kind of tinny. Now I only have to use my bluetooth headset when I am out of the car. Some of the newer roads in my town are not in the system, but I have not updated the maps yet.The only downfall so far is the unit shutting itelf down. It does this if it is charged too long or if you turn it on and off too quickly. It is easily reset, but just bothersome.