I use and like CA hinges in models up to about eight pounds or so. I've never had one fail, though I suppose a very frequently flown plane (like 20 flights a week all year) might flex them enough to weaken. The Kavans are certainly more rugged, but any hinge can be installed improperly and a properly installed CA is better than a baddly aligned and glued up pinned bearing.

One of the biggest advantages of the flexing CA type is that they cannot be misaligned. I've seen models where metal pinned hinges were so crooked it caused servo failure from fighting the hinges.

Bennett Built sells BIG CA hinge material for 30 lb models. Someone must be trusting $2,000 models to them.