I work 8h sitting in the same chair and the padding is quite worn (weight 75kg, it is not so much).
I bought this cushion for being viscoelastic and it's fine, but a little more firmness would have been interesting.
At first it has shapes that are strange, but then it adapts to your body, perhaps too much because it stays in less than 1cm between your body and the chair (tested on the floor)
The "holes" fabric is good, comfortable and does not seem to give excessive heat. For summer in very warm areas and without air conditioning can be interesting to try the "gel" models.
Would you buy again? Yes, but better firmer.