After retirement of Leatherman Pulse new heirs of PST line were introduced: models Kick and Fuse. Fuse was more functional and a bit beefier, while Kick was designed to be smaller and cheaper (at a cost of functionality).
Distinct locking system of Leatherman Pulse was dropped in new models. Fuse introduced different locking system - simpler and less elegant, but more functional (simpler to use and locking all tools). Kick simply had no locking blade.
Both models had Zytel handle inserts for more comfortable grip. They also introduced few tool modifications: beefier pliers, new matte finish, wire stripper on opener, and slightly redesigned screwdriwers. On the other side, diamond-coated metal file was removed from both of them.
Fuse had larger and beefier main blade and included scissors (which thumb rest was a bit enlarged for improved comfort). Kick was slimmer and lighter (though still a bit bigger that it's PST grandfather).
Fuse and Pulse thickness
(Fuse on the left):
Fuse and Kick thickness
(Fuse on the left):
Pulse and Kick blades had similar length and thickness
(Pulse on the bottom left):
Fuse blade was both longer and thicker
(compared to Kick, Fuse on the bottom left):
Fuse scissors had bigger thumb rest than Pulse
(Pulse on the bottom left):
New tools also have a beefer pliers
(Pulse on the left):
Pulse on the left: