We bought the Worldnav GPS with truck routing software. It was very user UNfriendly. We had a Tomtom and it started malfuntioning. We decided to give the worldnav a shot. big mistake. It is very hard to use and does not offer many of the on screen options we had become used to with the Tomtom. The truck routing software does not work properly. We were 10 miles from our destination on a state hwy. and it kept trying to route us off the state hwy. even though our destination was on this state hwy. We talked to worldnav and they told us 1) we don't know why it did this and 2) you can turn off the truck routing technology and only use it when you think you might need it. After many phone calls we returned it and got a full refund. This part went well.
We got a new Tomtom back in the mail and this one works very well. If you are going to go with electronics to get from A to B we combine the Tomtom with Street and Trips with GPS locator. 90% of the time we use the Tomtom alone. I won't drive without the Tomtom. It has many on screen features I won't drive without. It has a compass, miles to destination, how much time to destination, current time, ETA and miles per hour, all on the screen at the same time. No one else offers this feature. My wife hates electronics but she loves her Tomtom and all the options it gives her for routing.
To recap, World nav BAD!! Tomtom and/or Street and Trips with GPS Locator Good.
P.S. We have Tomtom One XL.