Koko tried a powered chair, for 4.3km. I was surprised how much I feel the shock every time I ride over a small rock, manhole or curbs. It may not be only the shock absorbance issue. It may be because COGY really responds to our body. When we see the curbs, our mind is ready for the shock. When I am on COGY, the actual shock and the shock I was prepared are almost the same.
I feel COGY is a part of my body, more than I feel with powered chair.