I'm sorry I didn't notice this question until now.
It's a bit late, but here's the answer to your question.
The downside of this cushion material is that you have to install the pressure-receiving plate, apply temporary tension, and then inject the material into the cushion.
Also, since it becomes fully set only after curing, it’s quite labor-intensive.
I don't think it will have any particular impact on the final product, but it is certainly time-consuming.
On the other hand, since it is injected firmly behind the pressure plate and can level out any unevenness, it is highly effective.