I have the quatro FSW 95 and also the Tempo 84 twin. I am about 75kg. The FSW is a wave oriented board but still good for general coastal sailing. It is not the quickest to get going but is smooth over chop. It feels small and compact for a 95 litre but gives good float. On the wave it prefers longer turns and is not as snappy as the Tempo. I use the FSW95 with a 5.7 and 5m sometimes which it is fine with. Not sure what bigger sizes it will take.
I tend to use the Tempo a lot more as I typically sail in 5 or 4.5m conditions and prefer the snappier turn in the rubbish waves I sail in. I actually keep thinking that I should replace both with a Tempo 92 - I think this would be an ideal compromise. The Tempo is also very much like a wave oriented FSW but looser.