What to look for in U-pull Magnum?

I don't know if it's 9 out of 10, but there are definitely many that are cracked.

9 out of 10 aren't cracked enough to go into water jackets. Most of the time from what I hear, there is no guarantee they will ever hit water. Folks tend to sensationalize this.

If they aren't visibly wet, run that sh*t.