The joy of this system is that you can now fire a NERF sidearm completely one-handed. This is the first NERF pistol to mimic a single-action revolver like those made famous in the Wild West. The hammer can be cocked back with the thumb of the same hand you will fire with. This means a plethora of options has opened up. You don't necessarily need to drop your primary blaster to wield a sidearm anymore. You can dual-wield a blaster without the vacuum-like noise of a flywheel system. You can also make your weapon "safe" as a one-handed instead of firing it, should you change your mind.
Sadly the Sweet Revenge gets a much better set-up than the Hammershot. You can get the Hammershot exclusively at Target in the US for $14.99. You can get the Sweet Revenge Kit pretty much anywhere for $19.99. Why is it a better value to spend five more dollars? Stylin' eye protection and that holster. I personally think that the Hammershot by itself is worth the $14.99 price tag. You could look at it like Sweet Revenge accessories are just $2.50 a piece. Or you could break it down to about $6.67 a piece between the blaster, the eye-wear and the holster. It does make me wonder why the Hammershot hits that $14.99 mark, but I figure that they were making a break on the Sweet Revenge (since it's part of a new line) rather than marking up the Hammershot.
I'm still not sure which blaster I like better. I was getting used to the size of the Hammershot. Then I put the Sweet Revenge in my hands. I personally don't need to use the holster with my current load-out, but the grip may actually be better for comfort. I'll decide on that before the upcoming review.