When I bought my bike, it had these Specialized Armadillo something or other in 38mm. They were just as heavy as these studded Marathons (~1000g) but not quite as stiff, and about 2mph slower. I rode them for a week, about 100 miles. I don’t think I could have ridden them every day long term. I’d put them on a second bike if I had one, but for now they’re the next set of tires for my wife’s bike, that gets ridden about 5 miles/week. They did have really good grip though, dry and wet, sand and grass, even on some light singletrack. I don’t think they’d puncture very often. If they rolled a little easier and fit under my fenders I’d have kept using them. I was worried these studded Marathons would be slower than those Specialized tires but they’re not. Aired up, they roll faster. Aside from turning, they roll the same speed as the 600g Kenda Kwest that they replaced. They squirm during turning but I think the idea is you slow down for turns anyway. On the straight, they really do OK. I’m looking forward to see how they’ll do on the slick stuff. This is my first set of studded tires, first winter riding slick roads. I rode a little last winter but carpooled with my brother mostly.