I ordered this blade directly from Butterfly shortly after it was released and specified 90g and a flared handle in order to compare it to my regular Viscaria and my LGY, both a similar weight.
The blade was exactly as specified and came in about 2 weeks. Well presented and with the quality I have come to expect from Butterfly I glued it up with a few different rubbers, including T05/05FX and Tibhar K3 / R7 as these were all rubbers I had used regularly and so knew what to expect.
The handle is very similar to the Viscaria and LGY in dimension and feel and the blade balance also felt very similar.
In short, I would have a hard time separating this blade from either the Viscaria or LGY - very similar in speed and response. If I was pushed I might rank the FZD as slightly slower than the other two, but in a blind test I doubt I’d be able to differentiate. I had previously owned and played with a TB ALC and would say that whilst the FZD is clearly from the same stable, the Boll is slightly harder feeling and slightly faster (I also had a straight handle Boll that I didn’t really get on with)
So, for anyone looking for a Butterfly outer blade I would certainly recommend the FZD. Ultimately I sold mine and went back to my trusty Viscaria’s as I just enjoyed the feel of these a little more, but I could have kept any of them and been happy.