Anybody tried these on a GMC 2500HD

For what its worth I went ahead and put these on my 2500HD and they are well worth it. They dont make the truck ride like a cadillac but they certainly take that harsh jar from big bumps and smooth out the highway a good bit. overall very worth the money to ease the ride on a 3/4 ton pickup

I'd never heard of them until you posted. My Dodge 2500 could use something like that. It's less than smooth on rough roads.
I do question their warranty. It's limited lifetime but with 10 yrs on metal and 3 yrs on rubber parts. What parts are left for the lifetime?

11 years ago I bought a set of velvet ride shackles, lasted about 7 years. Needed a new set (lifetime warranty) but the company was out of business. Worked good just not the warranty. 2004 2500hd

Had a set of the BFG Velvet Ride shackles on a 2000 F150 7700,
They were terrific. Made the ride civilized and Tamed washboard.

No issues after a dozen years hard use.