Superdelite pros and cons - Worth it the extra weight?

I would take the R&M suspended rear carrier with panniers with batteries in them over this axle centered rear rack carrying panniers with batteries in them.
How well does the rear suspension work with added weight attached to the axle?
I do not own that particular model bike and I have never carried any bags on one but I assume it would handle the bags as a hardtail does like my Charger.
 
I'm sure when they design rear suspension it is without extra weight like this, extra stress on rebound, etc.
 
I'm sure when they design rear suspension it is without extra weight like this, extra stress on rebound, etc.
But I do carry 2 batteries in my panniers on my Samedi FS Race 4 which has a Topeak Tetrarack M2 attached. There are no issues. I would not attempt any jumps with the spares onboard of course.
 
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