Hard to go past Garmin ... they are the most compatible with various forms of customised data, and the easiest to find maps for.

I like to see the maps while riding so small screens like the 60CSx are no good for me. Fine if you are on foot, but doing 100km/h down a dusty bumpy road, you will not be able to read it. I have ridden with guys who have a 60csx and they always have to stop or slow right down to read it and manouevre the small buttons and controls on it with riding gloves. A bigger screen and bigger buttons comes in very handy - so you can read the maps, town names and control the unit while riding. Similarly a touchscreen allows you to scroll thru maps more easily while riding. Thats at least what the Zumo does. The 400, 450, 500 and 550 all have a screen twice as large and with twice as many pixels as the 60CSx, large buttons for gloved fingers and a touchscreen. The flipside is the Zumos are 25% heavier and more expensive.

I dont have any experience with the new 660 Zumo, but they have a considerably larger screen yet are lighter than the 400-550 Zumos.

I was surprised what the Garmin units still cant do. They have a very limited ability to plot predetermined routes into the unit. They have pitiful internal memories, and in many ways I have been disappointed with how they perform. But they are much more durable and rugged than any other brand out there and on a long bike trip, that counts for a lot. If there is one thing I was impressed with the Zumos, its how durable they are.

__________________