Another benefit....
Passengers that ride in the back now say it's more comfortable back there. Bumps are less severe -- like they should be. Yes, the springs/shocks are getting to do their job instead of rubber mounts.
I'm more convinced it was the right move for a stock height VX.
BTW....How about "Frame grommets!" LOL Also, why wouldn't springs be part of the axle assembly? When you pull a car backwards, SOMETHING's gotta wind up to make it shoot forward! All my toy trucks do that anyway! <sheep-eating-grin>