I don't know much about em besides that fact that it would come in handy, and I am planning on driving a long trip within next week or so, so I have been looking at different kinds on the internet and I am completely lost as to which one would be good for me. I imagine a few people on here have them and would love some input on which ones work well, which GPS units to avoid and etc. Do they require a monthly fee to use them? I don't wanna spend too much money, I did a quick search on google and found this Amazon.com: Garmin nüvi 1390/1390T 4.3-Inch Widescreen Bluetooth Portable GPS Navigator with Traffic: Electronics which had good ratings but again I don't know much about these and if I am gonna spend like $150 on a GPS I wanna make sure I get a good one with no problems. If anyone would help me out it I would be very grateful cause I have so much going on right now I am stressed enough as is.