Is the join between the Xtracycle and the Karate Monkey solid as a rock? or does it flex around a little?

The bike I'd be putting the Xtracycle on is an aluminum frame (Kiddo fell in love with the steel Smoke and now it's his bike, so I'm back to the aluminum Dew) and I worry the aluminum won't take the strain or flex of an Xtracycle and will fail.

Sure do love those Albatross bars. I like a narrower grip, so I'm thinking about a Nitto Dove. I'll have to see what comes of that...