I used a RVND 7720 on a recent trip from Las Vegas, NV to Roseburg, OR and back using different routes. On the way up I got two "scratch my head" directions that I ignored and made the system reroute the trip to the way I thought it should go. Other than that it performed well, with the exception of the Sharp Curve warning, it was off in its warnings more often than correct; however, it was easy to tell when the system was overreacting to a curve ahead. I really enjoy the Speed Limit changing ahead function, it was spot on the entire journey. I did encounter one Low Bridge that it did not warn me about, instead it warned of a narrow road, which it was. The bridge was 15'-10" and I have my system set at 16'-0". Overall I am pleased with the RVND 7720.