I've been riding aluminum since 1987 and the only frame failure I had was an older trek frame that used the bonding of tubes with some kind of glue at the bottom bracket and head tube.

The bond on the bottom bracket came apart during a downhill run.

All welded aluminum frames I've owned have been bullet proof, especially the Cannondales. And I've ridden C'dales for the past tem years except one Specialized Epic I now own.