Yeah....I have a few of the P-51s and P-38s. The big one is much nicer and works faster and better...P-38...aka the "John Wayne"
P-51
The P-51 is a full 2in long. The added length affords more leverage and doesn't require as much thumb pressure to use. Some prefer them over the P-38s because a P-51 will open cans much easier and faster and will last much longer than the P-38.