GPS, What a good one for RV'ing?

My personal advice is to stay away from the RVND 5510 or 7710. They have lots of features, very RV friendly but the processor is garbage. I have had it replaced 2x because it would simply freeze up, usually in the most convenient places like the Washington DC beltway. And then it turned off never to power up again. I was told the first time by a non English speaking customer service rep that it may have bad files and I needed to do a correction. That took about 4 hours. The map downloads are painfully slow and for whatever reason my new one they sent me 6 months later is freezing up requiring continual reboots and then tells me my route will be on dirt roads in .6 miles. Odd when you are on I 95. Happens EVERY time I boot it up. When it works it's great. Unfortunately it's not systemically reliable and craps out when you need it most. The touch response time is horrible. Literally 10-15 seconds after I touch it before it reacts. And heaven forbid you ponder whether it accepted a command because if you touch it again it simply stops working. And Heavy.. It's a brick and requires a bigger than usual mounting surface. Velcro won't cut it with this monster. . It's only redeeming function is a paperweight as despite it's leaden feel it's still too light for a boat anchor.