Anybody use HRS EXR racks -any feedback (or maybe lack thereof lol)?

I've only heard good things about them. Cable Company is a dealer. I would call them and see if they can send you a demo. It looks like if you take it apart, it will probably fit into a box that's fairly manageable. It takes away all the risk if you can try the rack first. 

@mulveling 

To clarify - I’m not experiencing feedback issues with my setup. In fact the sound is very good.

The main issue is external vibrations that cause skipping based on the sensitivity of my cart (DS Audio W3) - its a very light cart, amazing sound but it requires proper stability.

Since I dont use any purpose-built audio racks, this would be my first. Based on the level of equipment I have, the HRS is the primary recommendation. The fallback would be something from Solid Steel.

@inthesticks 

the HRS is the primary recommendation. The fallback would be something from Solid Steel

FWIW: when I ordered my EXR rack there was a 4-6 lead time, and while I waited for it I used a Solidsteel S3-2 two-shelf rack with a HRS R3X isolation base on top. It worked OK, but nowhere near as well as the EXR rack does that replaced it, especially for footfall and other externally born vibrations. Of course, that's comparing a $400 rack to a $6400 rack.

I have had success with Adona racks, which are less costly than HRX, assuming Adona are still in business.

The main issue is external vibrations that cause skipping based on the sensitivity of my cart (DS Audio W3) - its a very light cart, amazing sound but it requires proper stability.

It means the shockwave from footsteps (or even loud playback in some cases!) is causing your rack/cabinet to "rock" ever so slightly, which in turn is energizing / exciting your cartridge suspension to the point the groove can't hold it. The solution here is the same as with subsonic feedback (woofer flapping): much better rigidity in your rack and its anchoring to the floor structure. Your selected HRS will solve the rack's need for rigidity. And fortunately you didn't select a really tall one. If you're on suspended wood floor, you may still find it necessary to anchor to/against a wall - just depends.

A top isolation shelf (short of maybe a Townshend or Minus-K) won't really help here IME, unless you were already right on the edge of success. Adding mass on top (lower rocking frequency) is equally likely to hurt as to help. Anyways I hope you find good results, and it sounds like you'll get there. The times I was fighting this were TRULY frustrating. 

I have had success with Adona racks, which are less costly than HRX, assuming Adona are still in business.

He's still in business. I follow him on FB - good guy, nice system. Nicely designed, very sensible racks. If I were starting over I'd get Adona racks (Altair), with money saved there for other components.