I have used my TTLE for the last 3 days driving 800+ miles and am amazed by it. As for the destination time it was about 30 minutes off for about a 200 mile drive but I also was going 5 to 10 miles per hour over the speed limit which would make it about right. It also corrects the time while you are driving so you know about the time of arrival. I purposely went off course a couple of times and after a mile or so it would correct the directions for the route I was going (if I was taking an alternate route to the same location).
I am very pleased