It's massively down to how individuals like their cars to feel, views will be all over the place. From experience with a powerflexed 156 and 159, I found it ruined the ride quality, might have made the cars taughter and sharper, too sharp, grabby, would've been nice on smooth Tarmac, but had zero forgiveness on standard roads, even riding over cats eyes was traumatic. Try feeling a bush before you fit it, there are softer metals. When I had the PF stuff taken off the 159, I couldn't stop smiling how much nicer it was and it didn't realistically suffer in the handling stakes, in fact it was betterand more sure footed at high speed because all the grabiness had gone.
My GT has all standard bushes, FSD dampers, Koni springs and a strut brace and I just don't think it could be any better, lovely solid ride and so together over crappy roads.
As I say, lots of people love them, some hate them, I f@@king hate them.
GT 3.2 V6 - Q2, KONI FSD & EIBACH PROKIT, GTA REMAP, MICHELLIN PS3's, BMC CDA
159 SW 2.4JTDM TI - ALFATUNED, WIZARD BACK BOXES, KW V3 COILOVERS, NOKIAN WR A3/MICHELLIN PS3, PCA DYNAMICS ALIGNMENT.