I have a 60CSx. I bought it 3(?) years ago for use in the car, on the bike, walking (both trail use and in cities). I've taken it everywhere. I even took it to Europe and used to to navagate while driving which was a lifesaver. I have no idea how an American like me goes there and drives without a GPS or someone that knows the roads in the car with you. My favorite moment, the GPS directed me to drive over a small curb and across the patio of a downtown cafe! So I did, only to see 4 cars follow me. That WAS the correct route!
That said, I'm not crazy about the unit. I expected it to be better. I have a lot of money in the device, over $1K. The software is silly expensive.
For trails, hiking: I found the topo maps to be just about usless for navigation. I never use them. They do an excellent job of telling you were you've been, but the unit will only draw a straight line to where you are going and that's useless. So if you are mapping where you've been fine, but if you want to use it for navigation, forget it. This was the unit's major disappointment to me. I guess you can download known routes and track by them, but that never worked for me. I wanted the unit to help me "explore". Wasn't going to happen.
For motorcycle use: I find the display too small a lot of the time. For me, that keeps it from being a top notch motorcycle unit. Also, it is necessary to pack the battey compartment with foam to keep the batteries from vibrating loose and shutting the unit off. GPS mounting solutions can be a headache too. I've bought 3 mounts and don't like any of them. (2 for car, 1 for bike.) So I've still got to figure out the mounting.
Urban Walking: It is 100% great for walking in cities. Great, great, great. It is small and holds onto the signal like I would not have believed. Urban canyons, trees and most bridges are no problem at all.
It is versatile. It does fit in a pocket and go anywhere. It gets terrific reception. The small size is great. And it sure is a ton better than not having a GPS.
I give it a B. Costs too much. If it breaks, I'll look elsewhere.