I've had the full Gwyn lewis +5.5 setup front and rear on my 90 for over a year and the only problem has been is with the polybushes on the rear which keep popping over the flanges on the rear trailing arms, maybe thats the problem with so much articulation, you don't notice anything untoward when offroading, they probably keep popping on and off, but when going home you will feel like you have a puncture at the back, I just pop them back over the flange with a big screwdriver. I'm using polybush blues which are supposed to be the softest?
The front shock turrets stick through the inner wings almost touching the bottom of the expansion tank, making the turret covers redundant, unfortunately allowing considerably more crap into the engine bay, I haven't fathomed a way around this
Another thing is to use LR bushes in the radius arms to axle bushes, as polybushes restrict the downward articulation at the front by about 2 inches, as I found out after polybushing all round, so replaced mine for LR ones which I pushed in using a big vice...movement back..
I've the terrafirma shocks on mine which have a shaft size which is considerably thicker than the procomps they replaced, I would imagine the ome stuff is heavy duty too.
I'm happy with mine all said and done,