i sent Daneil a email about this, and included this thread and here is what he said:
I'll be honest with you, that problem with the valve has occurred in
the past with the Fusion but is a very very rare issue with the F8.
Since the F8 has been released, we have received less than a dozen
markers total with not just that problem but any problem at that. So
you can take my word when I say that I trust the reliability of the F8
what i can conclude is that, there could be a slight risk of the valve breaking, but 1) dp will fix it, and 2) its not a big of a problem as we think it is