Anybody running the RMS AlterKation? Was it really worth the cost?

I think the problem is people over estimate what the need/want. If your never gonna corner faster than .85 of a g no point of building a g machine. Which your not gonna hit too often in your daily driving. Decent tires, heavy duty sway bars and a slight lowering go a long way. But if you got the cash and can't find a better way of spending it go ahead nothing wrong with a tricked out suspension just know it's not absolutely needed to make your car handle.
agreed. and I say that as one who owns 2 mopar cars, one with a full four corner coil over system and the other that's simply has hemi T-bars in it. The biggestest reasons I went with the coil overs on all for corners (All Gerst Suspension stuff) are:

Weight savings, roughly 120 pounds total, roughly half-60% of that in unsprung weight,
Four corner adjustable weight bias, something you can't do with the leaf springs
Adjustable rear roll center, something you can't do with the leaf springs
Adjustable pinion angle, something you can't do with the leaf springs
Adjustable front geometry. something you can't do as much with the factory front
Clearance around the headers, transmission(eventually a t56)
Ditched the big heavy factory power steering box for a rack weighing half as much with better feel (IMO)

and a few other minor reasons including finding more options and cheaper options locally for brakes and such.

But thats in my pro-touring build on my dart. My 64 Polara is gonna retain the factory suspension as its a cruiser.