For the vast majority of shooters I would say that the silicone yolk is fine but personally I don't have the same amount of strength in my left wrist as I once had and on the odd occasion I struggled with it. 90% of the time it's all fine and dandy but for the 10% when I know it will be an issue I swap it out.
The problem for me was the application of pressure to keep the yolk splayed whilst at the same time concentrating on the aim and the aim suffered, I will add that no shots were taken whilst this scenario was ongoing.