There are some disadvantages such as having to plug it in and removing it but that is also some of the pluses. You can move it to another car, It is dependable, updating takes a little time and cost but it is so worth it. Processing Speed It works well but you do have to learn how to put in the address. It doesn't do well with partial addresses and you have to know if it is a street, avenue or other. Map Quality & Accuracy The coloring in the map is great. Not so harsh it bother you at night but bright enough that the I can still read it if the sun is coming in through a window. We live close to a area that the streets are difficult to travel on. Lots of dead ends, canals to cross and streets that stop at one point and change names .Even the navigational system in our new car gets confused but our "old faithful" Garmin" finds our way for us. We haven't downloaded the newest maps but it seems to find it's way better than the new one. Ease of Use We had to get used to making sure we had the complete address in it and this unit is really easy to program. I would highly recommend this unit and we do take it with us when we travel. We have found it is so much easier to use than the new one in our car, probably because we are used to it but we don't want to be trying to figure out how to use one we aren't familiar with in a traffic area so we just take ours with us.