We've still got most our original Rutgerson clutches, from 2001. They're all fine, although I have stripped and serviced them all at least once, which was definitely needed. I think they just get stiff with age, like everything. We have a spare handle on the boat, but never needed it yet (knock on wood).
Someone replaced a few of the cockpit ones with Spinlock ones, which are newer and beefier, but they were seized up worse when I bought the boat. The triple clutch block had the handles frozen on the shared axle - lift one handle, all three ropes go bang - bad! Also fixed them and still working fine since, but that's a potentially worse problem than broken handles.