I have a set on a 67-1, the fit and finish is fine. They are tight, I'll admit that. I bet they could survive a nuclear blast, but they definitely do not feel as good as wood grips do.
I'll say this, I was looking into a set for my modern N-frame, which is a round but (vs the 67-1, which is square). All them make for a round butt N frame is rounded grips (note the fine print, this seems to be the case for all sq vs round butt S&W). I called them to ask if they are planning to make a sq conv grip with a round butt frame and they told me no.
I landed up getting Altamont grips for my N frame instead. I much prefer the feel to the VZ. Truth be told, I wish I would have just went wood for the 67-1 as well.