Xtend-S is a Performance Tip released as part of the Burst System as well as the SlingShock System. It debuted in western countries with the release of the Rail Rush Battle Set as well as the SlingShock Starter Pack Z Achilles A4 11 Xtend-S.
Xtend-S is a Performance Tip that features a manual height-change gimmick, akin to Metal Fight Beyblade's Change Height 120 Spin Track. Unlike Takara Tomy's Xtend, Xtend-S has a mode-change gimmick that ties with its height-change gimmick, allowing it to switch from "Battle Ring Mode" to "SlingShock Mode".
In "Battle Ring Mode", Xtend-S features a wide flat base that has a sharp tip protruding in its center, akin to a wider Fusion. Like Fusion, when launched straight down into the stadium, the sharp protrusion in the center will keep the Xtend-S Combination stable and still in the center, preventing potential loss of Stamina. However, unlike Fusion and the Takara Tomy release of Xtend, the center protrusion is much larger. Normally, when such a tip is either knocked off balance by an opponent or launched at an angle, the flat base would make contact with the stadium, creating an aggressive movement pattern. But because the center protrusion is so large, the aggressive movement is even more unreliable than Xtend.
In "SlingShock Mode", the tip is extended and locked in place, revealing a wide hole-flat tip akin to Xtend+'s Attack Setting. Unlike Takara Tomy's Xtend, Hasbro's Xtend-S creates a much more substantial increase in height. Unlike Xtend+ however, the wide hole-flat tip rests on a tall and narrow base. While "SlingShock Mode" creates highly aggressive movement that would imply use in Attack Combinations, the diameter of the tip makes it somewhat difficult to maintain a Banking Pattern, and the tall height is very ill-suited for Attack Combinations, as Xtend-S Combinations in SlingShock Mode are highly vulnerable to being destabilized. Of the two modes, Battle Ring Mode has the greater success.
While Xtend-S has a greater height change than Takara Tomy's Xtend, since it is tied to its SlingShock Mode, this worsens its performance and makes it more off balance. This in turn makes Xtend-S better suited to be in Battle Ring Mode. Furthermore, the enlarged protrusion grants some use in Stamina Combinations if Performance Tips such as Bearing, Orbit, or Atomic are unavailable.
As such, Xtend-S is recommended for collection purposes only if one has Bearing, Orbit, or Atomic and is a welcome addition if one does not.