Hi. I am the assistant manager of a recumbent bike/trike shop. We have several KMX models in the store, and I've ridden each of them. All in all, they're decent little trikes. They're meant for "heavier-duty" riding. Heavier frames, thicker tires, etc. They go off curbs just fine, handle dirt and gravel better than most other trikes. They are, however, lower to the ground than some other brands of trikes. Doesn't affect the handling too much, but it is something to take note of. They won't replace a mountain bike, obviously, but they're lots of fun to take on dirt paths.