To make any 'real' use of Dislocation Cones means you'll need to do a bit (maybe a lot) more work to the axles/suspension to make real tangible or noticeable use of them.
Springs pop out when they're too short for the axle movement .. or the axle movement is too long for the springs. Many people remove the spring retainers and stick dislocation cones on thinking this is the end .. unfortunately they then often find they mangle bushes quickly, bend control arms, scrub tyres and other 'oddities'.
If you're using your vehicle purely as a toy at Pay 'n Play sites or Trialling it etc then they can get you some extra articulation but that doesn't necessarily mean grip as only the weight of the wheel and axle make the tyre contact with the ground, with no real pressure or force behind it.
If you can keep the springs attached and the wheel touches down then you have the weight of the wheel and axle, as above, but also the force of the spring to aid traction.
Also, don't forget that the droop you get on one side of an axle when a spring drops out can be negated by a lack of 'stuff' at the opposite end .. the other wheel has nowhere to go upwards, so steering/axle geometry can change dramatically .. not always for the good.
I wouldn't fit dislocation cones without a comprehensive look at the rest of the suspension system, and a long thought or two as to whether I need that much travel ...
Having said all the above, when you do need them, they're fitted properly and they work well, they can enhance grip, traction and 'climbability' off-road. However, for most people and vehicles they're a bit of bling and of no real value.
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