They are the way to go if you are building a strong motor.
Now what will they do for your motor's performance?
Here's what Epicycle in the AU has to say about Carrillos!

Little known fact;
The reciprocating weight (little end) of the Carrillo rod is the same as Titanium Pankl rod though the rotating weight (big end) is slightly higher. Machine the equivalent big end weight difference from the flywheel & you achieve the same result performance wise as Titanium Pankls at about 1/3 the cost.

How do you guys like them apples!