GREAT blades !!! I own the SP2, SP8, SP10, SP17, SP47, SP Kukri. AWESOME blades. Worth the money for sure. Made in America. The SP51 has my name on it as well. Soon.
I have batoned with all of them, with no issues. Handles are still nice & tight. They are a full tang, just not a full width or exposed tang, like on a Becker. The SP50 is a full flat grind that has a 1/4" thick spine. The SP51 is a sabre grind, like the Becker BK2.