My Toyoya Prius came with a built in GPS back in 2006 and it works well 99% of the time.Thinking of upgrading the maps soon but i have heard a map upgrade (DVD)from Toyota is very expensive unless i can find it eslewhere and upgrade it myself.I just bought my wife a Magellan Roadmate 3120-mu for xmas and will install that for her soon.Read mixed reviews on this but it was on sale for less than $80 so with money tight this year decided to give it a try.