Have used these tires for a bit over two years now, and find them satisfactory for most conditions. I run them at close to 80psi most of the time, and down to 60psi on rough trails. Not a pure mountain bike tire by any means, but can take on most gravel, dry dirt, grass and small rocks with ease. Gets a bit squirrelly in wet conditions and larger rock. Runs very smoothly on dry roads. I am very confident on these tires as the tread and construction appear very solid and puncture resistant. Only reason I would change tires would be to go more aggressive for off-road wet and large rock conditions.
I've ridden coast to coast across America on Schwalbe tires, and I recently purchased this specific width of tire for a rail-trail tour on the Blue River, Chief Standing Bear, Homestead and Mopac rail-trails in NE Kansas and SE Nebraska. We had heard that there might be goatheads on a section of these trails, so I wanted the best protection for worry-free riding. I had a fabulous six-day tour out and back on these trails and not a single puncture. The tires also handled a rainy, wet day on the trail with absolutely no problem - this width of tire cut into the top wet layer of crushed limestone with fabulous handling (while my touring partner's wider tires floated a bit on top, making his bike harder to handle). Fabulous worry-free tire that's perfect for touring on rail-trails.