If parts start busting look at where it breaks and you can tell if it was cast or solid stock. Lots of places machine sand cast parts - bodies of the reels & spools for example. If it was machined you can look at the inside of it or the bottom of it and see where it was cast. No hiding machine marks or cast marks.
Huge cost difference between cast parts & cnc parts!!! Companies look for ways to save money so watch out.
Pay attention to the anodizing as well.
Time will tell what will happen.