There are a few youtube reviews that show how they work but to be honest you ‘forget it’s there’ in the sense that you dont notice it working once you get on with it. The preload is also fully adjustable. You can go from as soft or to stiff as you prefer for your weight. Cranking the preload all the way up and adding the additional spring means it will only basically move if you klap something that gives you those ‘i wish i avoided that’ shock up the gooch haha.
It’s not suspension though. And i think it wasn't designed to be.
They guide you how to install your saddle on your bike considering your previous saddle position etc. It has about 7mm offset uncompressed. They recommend it set up at 20% ish sag/float. You also mount it slightly higher by a few mm to compensate for the sag. The way it moves seems very natural and basically unnoticeable to me. Sure, i guess it wont be AS efficient as rigid bike - but only to the point where locked out suspension on a DS still has some give pedalling uphill…if it even is that much. I got them for all day comfort.
Same with the stem, you would think standing up and putting your weight on the bars would make it bob. It doesn't. You hardly ever notice it working until you hit a noticeably rough section and make a point of it to look at the thing.
As a final point ill say that throughout everything else ive only done three 100km+ rides on the bike so far and my wrists and tjommie were noticeably more comfortable afterwards compared to fully rigid i was riding before.
i also wish it were easier to test these products out before you committed though. This guy’s honest vids helped me decide though.