The difference between the two is entirely in favor of the newer iteration:
- Coated locking block and barrel make grease unnecessary.
- Wooden grips are nicer than the old plastic ones.
- List price is lower ($977 vs. $1100+ for the Boberg pistol)
It does require properly crimped ammunition. Fortunately, pretty much all defensive ammo and about half of the practice ball are crimped. Think of that as buying high octane gas for a race car.