We've run a couple in Case decals, the same machine. They are tough, and pretty dependable.  We don't have rocks so I can't comment on that or the shock hubs, we don't have them either.  I can say they will take a beating and keep on going.  About the only problem we've had was when driver tried cutting an irrigation riser off, that took out the cutter bar.  And if you put too much hp in front (4760 or 2590) it can smoke the slip clutch, but I'm not complaining something has to be the weak link.  They will go farther, faster than a JD without choking but don't cut as clean (or as low) as some out there.