Took me a while to realise what i was looking at. If i've got it right thats a large girth foam type comfortable handle with some sort of flex, taking the harsh turns out of your wrist action. That fits over an existing handle. Seems good to me, no more cramp and pains up my forearm.
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Yes that is the bottom part you are talking about?
It does help have had that on all the time as have big hands find it hard to grip small diameter handles.
But the top part of the handle is where the it has been modified it allows you to have a wider grip.
And also in a more natural way eliminating cramps and pain up the arm including the forearm right up to your shoulders.