Right Engine Gear (Mystery Cutter)
Spin Gear: Right Engine Gear (Mystery Cutter)
Circle Survivor is the only useful one, the other two suffer recoil and serve no real purpose.
The latter is the most relevant, providing a good boost to Circle Survivor Defense combinations - Normal Base (Wolborg 4 Version) is very low recoil and other bases generally make an easier target for attackers. The main advantage of elevation is it moves the WD and AR further out of the way of attackers, making hits against the top part (generally the primary weakness of Circle Survivor Defense) much less effective, increasing both Defense and Survival ability.
The other use is allowing the use of First Clutch Base (Zeus Version) with Circle Survivor, fixing the latter in place and creating one of the Heaviest SG+BB setups possible (roughly on par with SG Metal Ball Base with 4 Balls and a Heavy Metal Core). This creates a bulky, tall, round setup which has a mix of characteristics of Circle Survivor Defense and Weight Based Defense.
Lastly, has some use in a gimmick combination using Hasbro's Flying Defense, Wide Defense, Circle Defenser and a lower-recoil Final Clutch Base, as a counter to taller, more compact Circle Survivor Defense combinations (in particular using this very EG alongside Ten Heavy and Roller Defense Ring and other similarly thick ARs).